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and sizes of openings being tested
Exhaust System - Force II - Cat-Back - 3 in Diameter - Single Rear Exit - Steel - Aluminized - GM Fullsize Truck 1988-92 - Kit
it extends the power band to be more robust and powerful from 5000 RPM to redline whereas without tuning the bulk of the gains are from 6000 RPM to redline
A vacuum controlled butterfly valve is utilized to improve flow at wide-open throttle while keeping things civilized and 'drone' free throughout
A/T Exhaust System - 64-72 El Camino Brake Rotors and sizes of openings beingExhaust System American Thunder Cat Back 2. 5 in Diameter Dual Side Exit 3 in Polished Tips Steel Aluminized GM A Body 1964 72 Kit