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The massive four-inch intake tube feeds the factory 90mm throttle body. Its diameter is necessary since the APS twin turbos fill the 370ci iron-block engine with over 12 psi of boost.
2006 Pontiac GTO Sleeper: Please Do Not Disturb

 The massive four-inch intake tube feeds the factory 90mm throttle body. Its diameter is necessary since the APS twin turbos fill the 370ci iron-block engine with over 12 psi of boost.  View Related Article

 

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