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@@grippgoat I haven’t noticed any problems at all. Something heavier might cause issues, but the phone is light enough that it seems fine. There’s a little ring I have to wipe off after removing the suction cup, but I haven’t noticed anything else.

@@Brokenandsilencedrec JDL uses high quality cats, so no CELs on the catted version. There are occasional pops on downshift, just like with the stock headers. The Borla S type is a popular choice, nice and deep 👍

@@Charles-ee5mm thanks for your reply!!

I did a ton of extra sealing. I got thicker weather stripping to seal the top of the box, I put a ziptie inside the grommet where the intake pipe enters the box and tightened it down to seal it, and placed additional foam rubber around the opening to the box where the snorkel comes in to seal that. Before I did so, the car was substantially slower from 30-80mph in third gear (timed using Draggy) than stock. The snorkel is really just for sound.

​@@Charles-ee5mmwhen you say extra sealing, do you mean just sealing it against the hood?

@@beterbarker No. I also mean sealing where the pipe enters the box, and where the snorkel enters the box.

@@kbandzzz_86I did not get a check engine. If you get catless headers (or headers either a VERY low cell count), you will need an O2 sensor spacer to avoid a CEL.

@@Charles-ee5mm appreciate the help! One more thing, with the HKS exhaust + headers alone, it wouldn't be as loud as this where you have the JDL FP/OP as well? Cuz I know the HKS L2-Spec is almost close to stock sounding and the headers def boost it up a notch

@@kbandzzz_86 The OP/FP is slightly larger diameter than stock, so it probably increases sound level a little bit. The HKS is pretty mild with stock headers, the difference between it and stock catback is much more apparent once you swap headers out.

@@Charles-ee5mm appreciate it so much! Will be ordering the JDL headers !! I cant wait till you dyno the car and bless for making these videos !!1

also thanks for the feedback

@@johnnyhodges8620HKS Spec L2

I have the fake noise disabled. The rumble is more subtle with the catted headers, but still very apparent if you compare them to EL.

I never dynoed it on the OEM snorkel. With the Outbound snorkel attached, I went from 207rwhp with the stock airbox to 220 with the GR airbox.

The K&N was the entire cai kit. I bought it used from another person, shipping times will vary from vendor to vendor.

Honestly deleting the carbon filter and adding a snorkel and post MAF hose is probably the performance and sound for the dollar champion. The GR intakes are unfortunately really hard to come by now. It seems like Toyota isn’t restocking them anymore. My theory is they are probably saving them for a special edition.

Correct, this is on the stock tune. I'm going to be getting a tune from CSG once I decide whether I'm sticking with these headers or the JDL UELs, and at that point I will dyno gain to show gains from the base map, and from the custom map after they provide one based on datalogging on both 93 and E85.

@@Charles-ee5mm You need to do a tune. I did Ecutek tune with PSR UEL and got 15Kw extra at mid range revs

@@RahulChandNice! I’m doing a custom remote tune with CSG. I’ll be posting an update with numbers on 93 and E85 once that’s done. They’ll be doing tunes for both the SME headers and JDL UELs for me to get a fair comparison.

Me too! I'm really curious to see how they perform side by side.

Glad it was helpful! If you want to stay quiet, sticking with the stock catback is probably the way to go.

I’m putting together a video on it now, should be up in a day or two! They performed well throughout pretty much the entire rev range.

Thanks Glyn! Which gear to use in turn 11 complex onto the straight was one of the things I was trying to figure out all day. I’ll definitely give that a try next time I’m up at Thompson. I saw your brothers out there, it looked like they were having a good time!

The STI was getting a shakedown after being rebuilt, almost bumper-to-bumper, except for the rusty gas tank that sprung leak on the track.

@@escargod I thought I smelled gas when I was behind it at one point… I was wondering if it was just running super rich at some parts of the rev band, but a leaky gas tank would explain it! I wouldn’t have guessed that it was rebuilt looking from the outside, looks like you did a good job with it!

I definitely liked the sound of the K&N the best. I’m pretty sure it performs comparably to a stock setup with the carbon filter removed, so if you’re willing to put in the effort to make it seal out hot air well, and sound it your first priority, it might be a good choice.

Yep, ASC was disabled in this, so the sound is all from intake/engine and the stock exhaust.

How snorkel with k&n sound ?

@@tareqshihabts The Outbound snorkel was installed with the K&N in this video.

Tuning generally isn’t needed unless you’re doing something like altering the size of the tube the MAF is in. The MAF sees how fast air is flowing, and the ECU does some math to compute the amount of air flowing in based on the speed of the air flowing by the MAF, and the volume of the pipe the MAF is in. As long as you’re not doing something that changes the relationship between the velocity of air flow and the volume of air flow, the ECU will compensate for any extra flow automatically. It’s not in this video, but I did test acceleration with the resonators in place, and the performance was effectively identical to the cup replica/hks pipe setup in this video that has both resonators deleted. If anything, I was tending towards getting slightly faster acceleration with the resonators deleted, but it wasn’t a meaningful difference (a couple hundredths of a second at most). In the GR Cup race cars, Toyota removes both resonators from the intake. Between that and my acceleration testing, I’m about 99% sure they do nothing for performance.