Hi,

As title really. Is anyone running 400 BHP on an aftermarket 2.5" exhaust system or is it just not possible?

Newage or classic...

Cheers

 

Was doing 400 bhp on a 3 inch system on a newage. I think it depends on the build as mine was starting to det at just over 400 bhp. Recently I changed to a 3.5 inch exhaust and now at 416 bhp as engine was at 97k when mapped so mapper would not push it.

 

I was running 400bhp on a 2.5 system - PPP sportscat and Afterburner Vortex, 2002 STi, not a built engine

 

does changing from a 2.5 to a full 3inch system make much difference performance wise.....