Super stoked so tomorrow I am having a buddy of mine make me a full 4" dp for my mk7.5 gti. Currently have aprs downpipe with my dbv2 is38 v2. Aprs downpipe is nice and all but i just want something different. The 4" dp will help with flow spool quicker and lower egts so its a win win. Could of just went with trackslags dp but i'm not a fan of how it tapers down to 3". Pic for attention just some material to make the 4" dp waiting on the rest of the material to come in.
I thought to a degree, a large DP can cause more spooling. Like 3 inch helps the system breathe more but going beyond that don't you have more air to push which can cause less back pressure as well?
I thought to a degree, a large DP can cause more spooling. Like 3 inch helps the system breathe more but going beyond that don't you have more air to push which can cause less back pressure as well?