I am currently running an Sti7. The only mod at present is the ITG panel filter. Am i right in thinking that the Sti exhaust bb is rather restrictive?? Is the Prodrive backbox the only exhaust one can fit without invalidating your warrenty?? Should i wait for the PPP?? I assume the PPP has an exhaust upgrade?

What should i do?

 

The Back box is part of the PPP. I'd wait and see if you want the PPP first. Prodrive does'nt like PPP's being fitted to non standard cars so you're probably better off deciding if you want the PPP or not before spending any more on an aftermarket back box.

Of course after the PPP you can swap out the PPP exhaust.

 

Thanks Neil. I think i'll wait for the PPP.