Hi All,

I've just purchased a 04 plate WRX and am looking to replace the standard exhaust with a cat back system which I believe consists of centre pipe and back box. I will also replace panel filter at same time. If I do thses adjustments will the ECU need to be remapped? I'm new to all this so any advice would be gratefully received. Also any other suggestions for mods...

Cheers.

 

it should be okay without but you will get more gains from mapping it.

Simon