2005 Pontiac GTO Intake Manifold and Throttle Body - Breathing Room
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The stock throttle body on the left has a large ridge around the bottom. This design is a means of torque-management and limits airflow up to about 50-percent throttle opening. "This is why it feels like the GTOs have poor throttle response," Jeremy says. "It's not the fly-by-wire system: It's actually the design of the throttle body." On the right, you can see it has been removed and the area smoothed. "There are many tables in the tune that limit overall throttle response and I made them much more aggressive. Together they make an outstanding difference in overall performance."Jeremy says that the average gain per port on the flow bench is over 10 cfm. "Most people look at the head flow but don't realize how much the intake limits the cfm one might see on the flow bench. Even a highly-ported heavily-modified FAST manifold will still bring down peak flow over 30 cfm on a head that flows over 300 cfm." View Related Article
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