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I'll try to answer what I can...and anyone can feel free to correct me 1. Yes, throttle bodies open up like butterfly valve. Throttle bodies can be too big because air goes in with higher velocity with a small tubing...but with a bigger tubing, there is more air flow, and you want the perfect...

Cobra all the way, and my opinion isn't biased ;P

aren't those illegal in some states? if not all?