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Info required on Exhaust manifold

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freebird

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Hi All

I have a standard S15 SpecR apart from air filter and 3" exhaust from the turbo back. I have blown the turbo to manifold gasket and have the whole lot off to replace it. So here's my question, how much benefit will I see from an aftermarket manifold and how much are they just for show, I'm an engineer and know all the theory’s, I was just wandering what peoples experiences were in the real world?
 

DeanS15

My car is so clean you could eat off it.
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the general feeling that i got is that until you are pushing past the 300bhp barrier you wont really see any real benefit from it, after that it is needed to go any further
 
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