How many bhp will an afterburner backbox give
On a standard uk wrx bugeye 2012? Will I feel
Any difference apart from the sound?

 

Not really no.Sorry

 

As above, the backbox will only change the sound. It's the rest of the system when added with a backbox that makes a difference I.E bigger diameter meaning more hot air can be forced out and even more power will be gained by removing the cats