Quote:
Originally posted by PKRWUD
Headers tend to be steel tubing, while exhaust manifolds tend to be cast iron. Ford did install factory headers in many of their vehicles, including the GT's, but that doesn't mean they couldn't be improved upon. Aftermarket parts are usually performance oriented, while most factory parts have things like emissions and noise levels in mind.
Take care,
~Chris
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yea, I beleive the non HO302's ( crown vics an GM) have cast iron manifolds. chris is mos definetly right about usin Aftermarket in performance apps. stock stuff is used for strictly for lower cost production, warranty longevity, an emissons testing. ever loooked at the design of stock headers an how they look like some one crimped them with a vise? now pretend your air an see how fast you can make it out the back of yer car... not an ideal mate for power makin...but i've also heard horror stories about replacin 4.6 headers, so be wary brotha.
hey a GM convert..cool!!!
