Ok so I know generally when you change the exhaust system on the Impreza you should get a remap!
But if I change my Backbox from a Prodrive one to a Afterburner Raptor will I still need to have a remap. I believe it's still 2.5" to 2.5".
My car is a UK300 so as standard it has a mid pipe with no cat and the Prodrive Exhaust as standard!
Thanks

 

You won't need a remap for a back box

 

No need for map on just the back box

 

I went from a Miltek cat back to a Blitz nur spec cat back - would that need a remap?

 

Sweet guys thanks.....I didn't think so but better to ask and be safe then sorry