how much?
If you actually read all this thanks!
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and as everyone else said, Save that 250-300 on the throttle body and put it somewhere else. Such as a used nitrous kit
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Far as the TB 52mm aftermarket is pure mistake, too many hassles when the stock one can be bored to that size cheaper and without IAC hassles. that is aside from the fact a stock engine really doesn't need much more air than the stock 48mm supplies, and that IF the bigger TB allows more airflow it would only hurt mileage and use more fuel if you have it wide open throttle more. at cruise the engine fuel usage is dictated by the power needed to spin the engine/drivetrain and fight the wind. TB size has exactly zero to do with any of that. You completely missunderstand the physics involved.
is the car automatic or manual? If automatic then the pcm needs reprogramming for a bigger TB or tranny damage can result. headers should be reprogrammed for especially since even a bone stock car can benefit from programming.
If so newb you don't want to do work and don't have a mentor, maybe start with something like gears that most folks pay for install labor on anyway. If an automatic 3.42-3.73 gears, if manual go straight to 4.10s, reprogram for the speedo and just to optimize the tuning for the stock motor.
Thanks

