I've got a new-age PPP back box currently mated to my 2.5" system. Now, I read somewhere (possibly on 22b.com) that in places the PPP back box is only 50mm pipework, and that really, it doesn't flow that well at higher power.

I'm now in a situation where I think the backbox is holding me back powerwise, *but* I really like the look of the PPP backbox and the fact that it looks like a standard subaru/prodrive item (makes the car a little bit like a wolf in sheeps clothing).

Would it be possible to just open up the backbox and rework the pipework in there (i've never opened a backbox, so have no clue what they look like inside) so that it has a "proper" pipework? I know the easy option is just to sell the ppp backbox and get a different one, but if I can avoid it, that would be great

 

i have a sti genome backbox for sale save you any butchering.

Its not too in your face styling wise and about the same sounds as the ppp with the cats still in place

just to give you another option

 

is the genome any better flowing, though?

 

yes as it is an STI tuned exhaust its not a standard replacement.

 

The PPP newage backbox is certainly not 2" unless there's an internal weld intruding somewhere? If you're running a 2.5" system, the backbox is not holding you back.
JohnD

 

Ah, just found the post I was on about earlier... 22B Bulletin Board: Prodrive Sports Cat D/P vs 'others'

Turns out I need to learn how to read properly