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Headers may add 3-5 hp depending on design and a cold air intake will add around 4-7 hp for a total gain of 7-12 hp untuned. Definitely worth it especially with the nice throaty sound you will get out of it.
Changing carbs probably wouldn't add much if anything, but headers and dual exhaust could give 10 hp.
It does depend on the engine, but I'd shoot a little higher and say headers will give a good 15-30 hp 3 or 4 hp depending on the engine
depending on the style of intake, and type of car you can gain up to around 20% hp
ABout 161 hp out of the factory with mods such as exhaust headers and wide pipe with cold air intake its about 218.
Need more info - cam specs - intake type - compression ratio - valve size - headers? - type of fuel
if you have EFI engine, replace your stock intake, headers, exhaust. installing racing filters improves air intake which can add power to your engine. replacing your stock headers and exhaust pipes with custom headers and mufflers can eliminate back pressure. doing this upgrade can give you additional 10 - 20 HP.
The amount of horsepower you gain from an aftermarket intake varies, on average though you will gain... 5 - 15 HP ...it is VERY rare to see over 15hp from an intake, if someone tells you otherwise I would be cautious.
if you can find the hp. of the eng., you can add between 12-20 more hp. for the headers.
K&N states 11.83 hp gain @ 4248 rpm
probably about 30 hp i would know bcuz i own exactley that
375 sound right?