JB4 going lean with downpipes???

[@AZG80M3]

Thanks for posting Eric, once again, great info.

[@elgapitan]

Thanks for watching!

[@blaisedishman8741]

Yo Eric could I get ur help with a custom map 6 93 tune p

[@Magicsgarage]

Great info

[@nlim03]

Do you feel any power increase for your car then?

[@11mattrox]

Will the same problem occur if I use the active autowerke high flow GESI downpipes?

[@elgapitan]

Nope should be all good there

[@franklinwatson7767]

JB4 is cool, but if you want the downpipes to properly work with spacers or no spacers, a proper flash tune is required, no if and buts about it...The Jb4 can only trick the ECU so far. Go ahead and send that ECU to Finland

[@mjgarage1]

Mine still comes on either way with a spacer or no spacer. 🤦🏻‍♂️

[@elgapitan]

So take them off at least you know the car is reading afr properly.

[@mjgarage1]

@@elgapitan ya I was thinking that but why would Terry burger tell us to put them on?