[madmelon]

Hurricane 4-2-1 Headers

If you want new cats/don't care about emissions compliance, get some 100CPI metal cats and put them about 300-400mm behind where the collector merges on the headers

A single 2.5" exhaust might be a bit of a restriction. Single 3" probably better and twin 2.5" better again. (I've got the twin 2.5" and it sounds unreal)