Hi there, i am new to this site and im looking for some advise with my 07 WRX.
The car came with an aftermarket exhaust fitted ( turbo back) now its not all from the same manufacture but i know the back box is Cobra.
Now a few months back when i first got the car i took it out for a good caining, things were going great and then the engine misfired and the engine management light came on and stayed on. I took the car to my dealer and they turned the light off and said bring it back if it happens again.
Ok so since then i fitted a standard STI back box for a little less noise as i was doing alot of miles, in this period i drove the car hard a few times and never had any misfires or manag lights. Today i put my cobra box back on and went for a spin, it didnt take long for the wrx to misfire again and put the manag light back on.
Has anyone heard of this problem? I can only think that this exhaust has never been set on the rolling road or maybe with the increased power the engine is boosting slightly to high and thats causing the mang light to come.