What sort of benefits can I expect from a P1 backbox over a standard UK turbo one, and would I be better off with one of these or a scoobysport/magnex etc.

Do the P1 boxes sound nice?

Help appreciated....

 

I think that you will find minimal power increase as the box is not straight thro' and is the same internally as your twin pea shooter. The only real differance is the tailpipe which is 3" single outlet. Consequently noise and power are the same. I fitted a Magnex centre and BB and am well chuffed with it

Regards
Glen