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Re: horsepower gains
They work in conjunction with each other, can't give you any meaningful idea of individually, because they might improve it or they actually lower response and low to mid power, as with putting larger cat back exhaust without proper intake mods will do...
The three together will probably get you in the neighborhood of 10-15 hp additional would be my best guess....
Powertrain controller is always nice...you got VTEC?
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