Here are some basic tips:
-Exhaust will be good for 5 to 10 HP, and depending on materials and construction, may save you a few pounds.
-A free-flowing intake will allow the engine to work more efficiently, and lowering the temperature of the incoming air will give you approximately 1% increase in peak power per 10°F you decrease the intake temperature. Putting lightweight heat shielding between the headers and the intake pipe and relocating the point at which air enters the intake will help to maximize this temperatur decrease. Expect an absolute maximum of 10hp from a complete replacement of the intake.
-Nitrous is fun, relatively cheap, and relatively safe if you keep it within reason. A "25hp shot" should be safe and provide you with a good fun button for passing, merging, or fucking around on the highway, according to your preference. Do not push the button in first or second gear.
-Forced induction should be left to the professionals.
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