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Message: <blockquote data-quote="Lee12609" data-source="post: 724736" data-attributes="member: 12415">throttle body spacers basically add cross section to your intake manifold which is good for low to midrange torque, doesnt help top end much. USUALLY they arent even a noticeable upgrade, but you know how some people can feel 2-3whp. throttle response is increased which is what most people are feeling if anything.does the EXACT same thing a plenum spacer does, and i've never seen anyone report any butt dyno gains from a plenum spacer. hell i've done throttle body/plenum/cai all at the same time on a 00 GT and honestly think it might have made a negative difference at all but 4500rpm and up...</blockquote>