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I plan on getting those standard painted flowtech headers (cheap) How much of a performance upgrade would that be?? i drive a 67' mustang 302 2brrl
 

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I take it you just have stock manifolds on there now? What size primarys are the headers? Full length?

Being conservative I'd say 15-20.
 

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... I'd say we can't tell you anything without knowing about your ride. It may well be the same considering other limiting factors. horsepower is made as a system, not as piecemail, although you'll certainly see a bit more low end. Considering a low lift cam, a poor ignition system or springs that are weak and old may be your limiting factors, your new set of headers may well do nothing for upper end efficiency; i.e. horsepower.

K
 
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