Already posted that vid :P
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5.3 iron block!!!!!!!!!!!! throw 40psi at it straight from the junk yard.
depending on the header brand and intake, sometimes stock parts are better
certain brand/type of exhaust and intake parts could even make the car slower
Iron Indian's GTO made close to 450 RWHP on his LS2 car with an intake/PS LT's/Pacesetter exhaust with different mufflers and a cam...I don't think it's in the parts...mostly...I think it'd be in the tune.
a good example would be the 350z's intake
the stock intake is already really efficient that by swapping to a $500+ BEST intake to buy for the z you maybe net 1hp
ive never heard of an ls not gaining hp by swapping stock manifolds and headers, id bet the tune would be the culprit, then again anything can happen
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