Interested in full replacement before chipping - i.e. DP/mid/back box. Want something as quiet as possible (really) and retaining legal emissions (no faffing at MOT time or bent testers or worries with roadside checks) - i.e. need DP cat I thought. Looking on PE website looks like you can have a cat in your midsection and no cat in your downpipe and achieve legality with apparently good performance. Anyone know other alternative catted midsections (PE a bit pricey for a midsection £429!) or catted downpipes? I am hoping that at least some of the benefit of a new system will be in better gas flow over stock as well as the gains achieved by removing the cat. Am I right in thinking that the DP really needs to be changed to achieve any reasonable performance increase and that back box and midsection changes are relatively insignificant? Is it worth just changing the DP or will this expose the flow limits of the stock midsection and BB? If I want to retain a catted system, for the performance increase and cost am I better off just going for induction kit and chip and leaving the whole exhaust system stock. My priorities are perforance:cost whilst keeping quiet and legal for emissions. Whaddya think?

You don't want much, then! Legal noise and emmissions, plus extra power? I think a PPP is the closest you'll get, but costs £2k. Or maybe a Link ECU (from BR Developments) and ScoobySport back-box would do the job. More hassle, but as good or maybe better; certainly cheaper.

Hoppy

John,

I had exactly the same requirements as you - quiet and with a cat for MOTs.

As well as Prodrive, both MRT