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The Helmholtz chamber is a resonance cavity that reduces the drone that most high-performance exhausts have at light throttle cruise
Muffler - Original 40 series - 3 in Offset Inlet - 3 in Center Outlet - 13 x 9
and no downside by upgrading to the Dinan High-Performance Intercoolers for the N63 twin-turbo V8
providing peace of mind as well as avoiding that notorious 'limp' mode when things get simply too hot
3in Complete Exhaust Kit 64-67 GM A-Body Midpipes The Helmholtz chamber is aExhaust System American Thunder Header Back 3 in Diameter Dual Rear Exit Steel Aluminized GM A Body 1964 67 Kit
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