AshMurc

Hiya

I suspect i will not be taking my car beyond 320ish bhp, so is there any benefit to running a 3"turbo back system? Would it be better to stay 2.5" if poss?
Also there is a great group buy on a 3" sprts cat down pipe, will this be ok with a 2.5" if i get an adaptor or will there be funny turbulence issues as the bore steps down?

Thanks
Ash

MY97 wrx wagon btw (standard so far...)

AshMurc

anyone?

53

iTrader: (41)

Nothing wrong with keeping a 2.5" system to make the best of that level of power.

Power Junkie

iTrader: (1)

2.5" is fine until you want to get much over 350bhp, I managed to get 394bhp on my H&S 2.5 turbo back system with a 321H but once I went to a 3" system i am now around 415bhp at a lower boost.

AshMurc

thanks guys

no detramental effects to fitting a 3" bore when i'm only aming for 300bhp? Apart from it being more expensive

And its fine to reduce down from 3" sprots cat to 2.5" cat back?

regards
Ash