Posts: 705
Since: 16/3/2007
Region: Bristol
Status: offline
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The mandate was that Pro-Speed:
1) give as much freeflow as possible
2) keep it quiet in the lower rev range, but allow all hell to break loose higher up
3) keep clearance good.
1) As you can see, it's pretty much a straight-through set up. Everything is stainless steel, and the cats are freeflowing 100cpsi sports models. So probably an extra 15bhp, and a little less weight.
2) When you rev the car at 6000rpm, it sounds like a Trofeo. I'm sure I saw a couple of bats flying out of the back boxes when I tried it for the first time. Amazingly, there is virtually no db increase around the 2000rpm mark, which is what I wanted as I do some early starts for work and I really don't want to bug the neighbours too much.
3) For those of you who are familiar with the underside of their cars, the overly restrictive 'pinch' in the pipes before the cats is to allow good ground clearance. Really, it's a design flaw I think, since it virtually closes the pipes. Prospeed have managed to keep the height similar to the pre-cats, which is a very impressive feat.
All in all, they hit the nail on the head. V pleased.
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06 GranSport (FD ECM, DBW, springs, filter, ProSpeed pipes)
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cant wait for the outcome 
