Just to clear the air before any questions come up, this is a 911 Exhaust mod we wanted to share as an alternative to an expensive replacement. In our numerous google searches we have seen this design called a Gundo hack and also a Fister hack so call it what ever hack you like but to us it is the Full Octane Exhaust Mod.
@CraigVader We are still in the early stages of 997 modifications and a cold air has not been on my radar yet. I found the Fister or Gundo hack made a huge difference and to be honest I am not sure the cold air intake would add that much to sound though it might get you a few more ponies in power.
I love your videos - One clarification. What you are demonstrating in the Fister hack (connecting tow pipes). The Gundo hack comes out of the other sealed off port and mimics the Porsche Sport Exhaust. In the PSE there is a valve that can be switched to open the other port or close it. The gundo is like the PSE always open.
I did this to my 2007 C2, I took the muffler out of the car then took them to a muffler shop , have them cut and weld they charge me $ 50 . You may says wow that was cheap, yes i told them its a Mustang muffler. Dont mention Porsche they will charge you $$$$
From what I researched, gundo and fister are two different mods. Gundo is from the muffler to the nearest pipe. Fister, which is what this video is showing, is a pipe between inlet and outlet.
Used your video to have my gundo bypass done. My nephew had the equipment and exhaust pipe so only cost was buying him lunch. BUT after watching your video, I would suggest you check your motor mounts. Tips seem low and every time you accelerated tips and "mustache" moved considerably. New motor mounts do an awesome job for putting more power to the ground and improving shifting. Just a suggestion. Keep up the good work. DIY projects are wonderful for those you try and enjoy their Porsche and save a bit of money.
The origin of this input/output Porsche muffler "hack" began with the first of there construction type the '94 thru '98 Carrera 993 mufflers. .. During the present-day 993 production,, a fellow 993 enthusiast by the name Leland Pete would popularized the I/O hack. .. It became widely popular with N. American 993 owners.. About year '94 or '95 the DIY hack was widely known as the LPMM. .. The Leyland Pete muffler mod. .. That's the history of the I/O LPMM.. The DIY LPMM in our '98 C2S is still going strong since 1999. ..
NOT to be done yourself OR by most muffler shops. Simply pay $370 to Fister and have him do it since at 4,000 units done the technique is solid. Everyone else will screw up and within 2 yrs you’ll have stupid problems. That said, you’ll gain vastly more interesting sounds in 3k-5k range although above that its hard to hear the fabulous sound of the variable valve timing (vario-cam). kick in. Also, the low end sound from idle and take off is debatably Suburu-like and its louder than the ultra quiet gen1 996.1 3.4 litre motors like mine. Years later, I LOVE it. I still put my windows down to hear other’s v8s.
computerhelpcc I believe Fister now charges like $450 plus shipping which is a bit ridiculous for this mod IMO. I’m going to DIY this soon as I don’t see how stupid problems would show up two years later. It’s welding, either you have a decent weld or not...
Thanks for the feedback, surely you must know a car guy with welding equipment willing to help a car guy friend out. You could do it with a small cut off wheel to make the hole and honestly the plasma only made the basic hole, I did all of my adjusting with a grinding wheel and sanding disk. You may have been able to do it with a hole saw, just be creative on the hole. Then you are down to finding someone with a welder or pay someone a few buck to weld it after you make it fit. In our case we have about was about $1200 in the Eastwood gear but we do use it on other projects. It can be done on the cheap :)
Admittedly... I got a chuckle from this informed comment, Curt. Thanks Rumrunr!.... James Reminds me of the ole Steve Martin joke on How to become a Millionaire.... Well, 1st... get a million dollars.... hehee
Bonjour, très bonne vidéo. J'ai l impression que cette modification change "légèrement" le son mais permets de garder un confort sonore lors de trajet plus long?
So according to forums and so on, a pipe diameter between 1.5 and 2 inches is specified, some also mean 1.75 inches. Now I ask myself what would really be the best with a 996 3.6L that you have a nice sound, but it doesn't boom, vibrate or anything else that would be an annoying noise. The main thing is that the flat 6 can breathe through the exhaust in the best possible way, even if the standard catalytic converters remain for the time being. Nice loud aggressive would be great without being at the traffic controls or the 2 year legal reviews. The engineers also know that a Porsche is louder than a standard car. So who knows what diameter of the bypass tube would be best? I am happy about your answers.
Rich, I was thinking that for several years then I finally bit the bullet and bought them. Having a blast now but still need to get a little more skill to use them better :)
Did it to my 2009 C2S, it was ok but it wasn't the answer. Tried it with and without the center muffler delete as well. Sounded better, which is not saying much considering the stock exhaust was extremely subdued, but still didn't sound proper.
OK.... thanks for the tip .... but ... i think what if you get checkt from an Police officer for the loudness of the car ..? And second... what if it is for you at a longer trip also to loud ...? Maybe if it is smarter to install a valve betwieen so you can switch it on and off ... ?? ! ! ! What do you think ... ???
$10 with a few thousand in tools lol. For most of us far easier and quicker to just order them modded from FD Motorsports. I also have to wonder if you are better off doing the bypass from the plug where Porsche does the bypass for the factory PSE - that still goes through 1 chamber rather than bypassing them all.
I did the same mod to my porche and am very pleased with the way it sounds. However, i started having carbon deposits on both sides of my rear finders. Anyone knows the cause and cure for this issue?
Thanks for pointing that out. I was comparing it to our 996 which has a more narrow body compared to our 2008. Assumption was wide body when it must just be a wider body :)
Oddly enough, I prefer the stock sound. It’s higher pitched and I don’t like the deeper tone of the Gundo hack cause it reminds me of the sound of a muffler with a hole in it (Gundo is a personal friend of mine, so I call it the Gundo hack).
Adding a X-pipe or H-pipe between the banks (at an equal length point) should increase the pitch by combining the two banks together evenly! There's a H-pipe crossover built into the stock GT3 muffler.
I just got my 2003 boxster S I'm thinking in do this modification 🤔 but will have some issue with the smog test???? I'm in California and in these area they are really pickies
I would not recommend that because all of the exhaust will stay under the car and I am pretty sure you will get a bad drone. I would take it to a muffler shop, I am sure they could do this fairly cheap as a side job.
It could be done with cheaper tools such as a grinder rather than a plasma and most car guys have a friend with a welder and a few tools. Thanks for watching!
I was wandering which part of state your in my 99 911 has engine on a stand now just had a complete refresh and mow would be my best time for anything before it goes back in
![Seungmin "그렇게, 천천히, 우리(As we are)" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/kAzmhLHePqU/mqdefault.jpg)
Just to clear the air before any questions come up, this is a 911 Exhaust mod we wanted to share as an alternative to an expensive replacement. In our numerous google searches we have seen this design called a Gundo hack and also a Fister hack so call it what ever hack you like but to us it is the Full Octane Exhaust Mod.
@CraigVader We are still in the early stages of 997 modifications and a cold air has not been on my radar yet. I found the Fister or Gundo hack made a huge difference and to be honest I am not sure the cold air intake would add that much to sound though it might get you a few more ponies in power.
CraigVader we love how you think, Man!
I love your videos - One clarification. What you are demonstrating in the Fister hack (connecting tow pipes). The Gundo hack comes out of the other sealed off port and mimics the Porsche Sport Exhaust. In the PSE there is a valve that can be switched to open the other port or close it. The gundo is like the PSE always open.
This is the fister mod, the gundo is different, similar to the PSE (with no valve of course to turn it on and off)
Just ran into the video, I might just have to do that for cheap Mods!! instead of buying a new sport Pack :) Thank you much!!
I did this to my 2007 C2, I took the muffler out of the car then took them to a muffler shop , have them cut and weld they charge me $ 50 . You may says wow that was cheap, yes i told them its a Mustang muffler. Dont mention Porsche they will charge you $$$$
HAHAAAAA! thats awesome!
The shop I went to did ask, and I was honest... and I was charged $170. That was on my 996. On my 997 I will say "Mustang" haha.
Thanks for sharing sir. You are candid and humble. When I see a couple of comments from geniuses here below. Keep the faith man!
Thanks for the feedback and thanks for watching!
From what I researched, gundo and fister are two different mods. Gundo is from the muffler to the nearest pipe. Fister, which is what this video is showing, is a pipe between inlet and outlet.
Great video! You've made it look easy enough for a software engineer to do.
lol...Thank you very much!
Used your video to have my gundo bypass done. My nephew had the equipment and exhaust pipe so only cost was buying him lunch. BUT after watching your video, I would suggest you check your motor mounts. Tips seem low and every time you accelerated tips and "mustache" moved considerably. New motor mounts do an awesome job for putting more power to the ground and improving shifting. Just a suggestion. Keep up the good work. DIY projects are wonderful for those you try and enjoy their Porsche and save a bit of money.
The origin of this input/output Porsche muffler "hack" began with the first of there construction type the '94 thru '98 Carrera 993 mufflers. .. During the present-day 993 production,, a fellow 993 enthusiast by the name Leland Pete would popularized the I/O hack. .. It became widely popular with N. American 993 owners.. About year '94 or '95 the DIY hack was widely known as the LPMM. .. The Leyland Pete muffler mod. .. That's the history of the I/O LPMM.. The DIY LPMM in our '98 C2S is still going strong since 1999. ..
Best way of notching the little pipe for bypassing, is just cut 1/3 of both side (from where u cut with plasma cutter) 45°straight
Beautiful sound
It sure is!
NOT to be done yourself OR by most muffler shops. Simply pay $370 to Fister and have him do it since at 4,000 units done the technique is solid. Everyone else will screw up and within 2 yrs you’ll have stupid problems. That said, you’ll gain vastly more interesting sounds in 3k-5k range although above that its hard to hear the fabulous sound of the variable valve timing (vario-cam). kick in. Also, the low end sound from idle and take off is debatably Suburu-like and its louder than the ultra quiet gen1 996.1 3.4 litre motors like mine. Years later, I LOVE it. I still put my windows down to hear other’s v8s.
computerhelpcc I believe Fister now charges like $450 plus shipping which is a bit ridiculous for this mod IMO. I’m going to DIY this soon as I don’t see how stupid problems would show up two years later. It’s welding, either you have a decent weld or not...
Outstanding video.
So $10 of pipe and $4k in welding and plasma gear
Thanks for the feedback, surely you must know a car guy with welding equipment willing to help a car guy friend out. You could do it with a small cut off wheel to make the hole and honestly the plasma only made the basic hole, I did all of my adjusting with a grinding wheel and sanding disk. You may have been able to do it with a hole saw, just be creative on the hole. Then you are down to finding someone with a welder or pay someone a few buck to weld it after you make it fit. In our case we have about was about $1200 in the Eastwood gear but we do use it on other projects. It can be done on the cheap :)
Admittedly... I got a chuckle from this informed comment, Curt. Thanks Rumrunr!.... James
Reminds me of the ole Steve Martin joke on How to become a Millionaire.... Well, 1st... get a million dollars.... hehee
@@Fulloctanegarage No Disrespect. Admire your thrift.....and I love the Movie the Jerk
Where you buying your welding gear from!?! I’d look for a new supplier as you should be able to get a good welder and plasma cutter for well under 1k!
You should really do it with stainless pipe and stainless weld if you want it to last, IMO!
Bonjour, très bonne vidéo. J'ai l impression que cette modification change "légèrement" le son mais permets de garder un confort sonore lors de trajet plus long?
Awesome!! Thank you very much for this video, very useful!
For $10 this is a good thought. Oh by the way, The welder might drive this $10 price a 'Bit' higher than first thought.
Yeah, a little pricer than '$10" after you add in the mig welder and plasma cutter :)
So according to forums and so on, a pipe diameter between 1.5 and 2 inches is specified, some also mean 1.75 inches. Now I ask myself what would really be the best with a 996 3.6L that you have a nice sound, but it doesn't boom, vibrate or anything else that would be an annoying noise. The main thing is that the flat 6 can breathe through the exhaust in the best possible way, even if the standard catalytic converters remain for the time being. Nice loud aggressive would be great without being at the traffic controls or the 2 year legal reviews. The engineers also know that a Porsche is louder than a standard car. So who knows what diameter of the bypass tube would be best? I am happy about your answers.
The stock exhaust will be metric, probably 55mm or 60mm on each side. A 1.75" bypass is close to 45mm and 2" is close to 50mm.
Perfect guys , you are the best
Those are some cool tools too. I need to get me a cutter and welder now...lol
Rich, I was thinking that for several years then I finally bit the bullet and bought them. Having a blast now but still need to get a little more skill to use them better :)
Wow that's pretty awesome cheers
14:42 - OEM
15:14 - Mod
I toggle between the two time stamps for back to back to back to…
Did it to my 2009 C2S, it was ok but it wasn't the answer. Tried it with and without the center muffler delete as well. Sounded better, which is not saying much considering the stock exhaust was extremely subdued, but still didn't sound proper.
OK.... thanks for the tip .... but ... i think what if you get checkt from an Police officer for the loudness of the car ..? And second... what if it is for you at a longer trip also to loud ...? Maybe if it is smarter to install a valve betwieen so you can switch it on and off ... ?? ! ! ! What do you think ... ???
Many cars came with this “mod”, because it’s a paid option called PSE (Porsche switchable exhaust).
It wasn’t on my 996.2, but I bought an OE PSE.
What is the cutting tool being used at 6.45?
I gundo'd my 997.2... Awesome
$10 with a few thousand in tools lol. For most of us far easier and quicker to just order them modded from FD Motorsports. I also have to wonder if you are better off doing the bypass from the plug where Porsche does the bypass for the factory PSE - that still goes through 1 chamber rather than bypassing them all.
Does this means welding stainless steel or not?
I did the same mod to my porche and am very pleased with the way it sounds. However, i started having carbon deposits on both sides of my rear finders. Anyone knows the cause and cure for this issue?
interesting... we have not experienced that.
why not do away with withe baffle box?
less weight..
What about the Cars COMPUTER will this mod throw a LEAN ERROR code
Why would it be lean? You are only bypassing the back box, they do nothing to affect the gasses
The Carrera S has no widebody, only 4S, GTS etc. models..
Thanks for pointing that out. I was comparing it to our 996 which has a more narrow body compared to our 2008. Assumption was wide body when it must just be a wider body :)
Oddly enough, I prefer the stock sound. It’s higher pitched and I don’t like the deeper tone of the Gundo hack cause it reminds me of the sound of a muffler with a hole in it (Gundo is a personal friend of mine, so I call it the Gundo hack).
Adding a X-pipe or H-pipe between the banks (at an equal length point) should increase the pitch by combining the two banks together evenly! There's a H-pipe crossover built into the stock GT3 muffler.
When did an 08 CS become a wide-body?
It is a wider body format than the 996. Not sure you could get them out on the narrower 996.
Can this be done on a 3.2 exhaust with a cat?
I am pretty sure it can as long as the mufflers look like these.
I just got my 2003 boxster S I'm thinking in do this modification 🤔 but will have some issue with the smog test???? I'm in California and in these area they are really pickies
This is all after catalytic converters. No worries about smog
Is this legal from a sound and emissions point of view (in Australia)?
Not sure but it is in the US.
Damn, I guess you are right around the corner in Brentwood?
Yes I am, what do you drive?
Can this be done on a 2012 997.2 turbo? Thank you
I do not think this will work on the turbo cars.
Sounds fantastic! If you’re in Ohio, I’m bringing my civic to ya. 😀
Full Octane Garage which welding wire you use?
I was using .023
I’m cheap and can’t weld. What happens if I just put a 1.5” hole in the pipe by the muffler and not insert/weld in the connecting pipe? Any downside?
I would not recommend that because all of the exhaust will stay under the car and I am pretty sure you will get a bad drone. I would take it to a muffler shop, I am sure they could do this fairly cheap as a side job.
Don't worry this guy can't weld either.
@@N911GT2 lol 😂
Once you have your $1000 + setup of welder and plasma cutter....yes this may be a $10 exhaust mod. Maybe.
It could be done with cheaper tools such as a grinder rather than a plasma and most car guys have a friend with a welder and a few tools. Thanks for watching!
@@Fulloctanegarage yep. I was just going to edit my comment that even saying that, I still watched till the end. Lol. Nice video.
I was wandering which part of state your in my 99 911 has engine on a stand now just had a complete refresh and mow would be my best time for anything before it goes back in
We are in Brentwood just outside of Nashville.
Why not just remove the muffler.. weight reduction
It’s insanely loud
a $10 fix with about $2K in tools
Phone a friend? It could be done without the plasma, then you just need a friend with a MIG.
@@Fulloctanegarage Would love to see that video ;)
Would recommend face and hearing protection.....my save you from not being able to see or hear your grand kids.
Ok I'm in Milan Tn