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WRX STI 2015 Catback Problem.

2K views 1 reply 2 participants last post by  arcticscythe 
#1 ·
I installed a catback system / ETS on my car without a muffler and i have realised a major loss in power and performance... Does anyone know why this might be?
 
#2 ·
I cant claim to know anything about ETS but from their website it appears that they produce both CAT back ( J pipe back ) as well as turbo back systems.

If you replaced your J pipe with or without a CAT then you will need a tune to properly utilize the extra flow otherwise your ECU will attempt to tune out the change and often times you will see a loss of power and fuel economy.

It may be as simple as taking the car in for a dyno tune, or it could be something larger but we cant tell for sure until you have the car tuned for the extra exhaust flow.
 
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