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Took the factory Throttle Body, hand ported and polished it, and polished and knife edged the throttle plate. Has quicker throttle response.
Had a BBK throttle body that was a POS. Replaced it with this one. Very nice piece.
GT-500 throttle body, 60mm. Gives much better throttle response and more air to the engine! (top) new 60mm GT500, (bottom) factory 55mm TB