After running these with a cat back, I picked up about 12Kws at the wheels. Next biggest gain you can get behind an air intake.
Oh & btw Simon, if you finally do get this off the ground, flick me a PM before you do speak to rpw

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It doesnt really matter how cool your exhaust gases are otherwise ppl would ceramic coat there entire exhaust.more specifically the ceramic coating gives the piping a higher thermal resistance, keeping them cooler & somewhat reducing the temperature of the exhaust gases being expelled.
What are you talking about the ceramic coating or extractors.It doesn't really give that much of a boost to performance, at least not enough to justify the cost IMHO.Some say it only gives a performance increase of 0.5 - 1.0 kw if anything at all.
more specifically the ceramic coating gives the piping a higher thermal resistance, keeping them cooler & somewhat reducing the temperature of the exhaust gases being expelled.
Sorry, I think you & Sam are right on that one... got my wires crossed a bit on that one i think... heat wrapping the extractors still not a bad idea.. especially if you're whacking a turbo on there..It doesnt really matter how cool your exhaust gases are otherwise ppl would ceramic coat there entire exhaust.
It doesn't really give that much of a boost to performance, at least not enough to justify the cost IMHO.Some say it only gives a performance increase of 0.5 - 1.0 kw if anything at all.
Talking about the ceramic coating, otherwise I wouldn't have gotten my extractors - I am yet to get the rest of my exhaust installed, have noticed a little bit of a performance gain at Mivec & better sound, but until I get the High Flow cat & Cat back it isn't performing to what it should.What are you talking about the ceramic coating or extractors.
No we need atleast 3 more ppl tell your friends lolis this GB actually going to start for real now.
i'm very eager to get these to go along with the exhaust i'm getting off Sam