stevestorms

Just fitted Magnex decat downpipe to my Fujisubo decat system on WRX 94 it has a scoobyecu and itg pannel filter running on optimax, I road tested it and you can now hear the turbo spinning up but although the car is fast im not sure if around 80mph onwards the performance has tailed off a bit?? any thoughts on why a decat downpipe may do this? is it because the boost is coming in earlier?? any ideas please, not sure how old my fuel filter is??

Daz WRX

Try posting this in technical, may get a better responce there.
Daz