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Kurt, The simplest things you need to do, are a chip, exhaust(w/heat), and a K&N powerflow cone setup. That should add around 30-40 HP. The "big bore" throttle bodies dont do much unless you upgrade all the fuel/spark components along with it.(like crank fire or programmable fuel) Even if you increase air going in, your O2 sensor is going to send a signal to the brain, and try to maintain a 14.7:1 ratio.
Marc
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