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M6 is an abbreveation for manual 6 speed... A4 is for Automatic 4 speed.
It allows you to shift into 2cd while cruising lightly, also called CAGS
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1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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