
From what I gather they are made of stainless steel, im not to sure of the heat capacities of steel but wouldn't this cause more heat build up than prevent it? Anyone know of a good material (not to expensive) as a substitute? Im also considering making a cold air feed getting as much ambient air as poss...How should I go about this as I am no mechainc, please explain in lamens terms.
One last Q

system including fitting? Pit stop quoted me $500 for a single 2.25 system, can I better that or is that as cheap as it comes?
What power gains are expected (i'd like to think at least between 5-10kw)
Im stopping there in performance mods as this engine is NOT worth my hard earned $$$, wait till i finish my degree next year and buy a Gts25t

(although i would have to say for a little NA 1.6 engine it has a bit of get up and go!)
Cheers.