Coupe5oh, I would buy a 70mm TB, unless you find a good deal on a 65mm. The reasoning behind that is, most aftermarket intakes have a 70mm opening, and a 70mm TB is said to be good to up to 650hp. Either one you buy 65mm or 70mm you'll most likely not feel a difference between. If you have the stock intake, don't buy another Throttle Body unless you plan on porting the intake opening to match, otherwise your going to have a gap in between the two when they are bolted up.
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