Exhaust/ECU
 

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