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I fitted a set of Harveys ported headers and one of his up pipes, I wrapped them along with a wrapped turbo and downpipe. It makes a noticable difference, the turbo comes in about 500 rpm earlier with an increase in bhp in the midrange, not much top end though but it is a road car sfter all. One thing though, Ive had to reseal the headers to up pipe because it was leaking.