Originally Posted by
JackCornick
I wouldn't have thought replacing it with a Ford mani would really be that beneficial for the £££. The standard RS mani and cat are horribly restrictive!
Id say the performance 4-2-1's would only really be worth it...
st170 manifold is a 4-2-1 mate and lets him have a cat with out custome weldin one in to the system and i have heard with the st170 manifold and cat u gain 10bhp+
matt