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GM Performance Parts & Service! Where GM Engine Performance Strives...

This isn't your normal GM site by any stretch of the imagination. MMX (Modern Muscle Xtreme) has long been a top tier performance shop in the Jeep, Dodge, Chrysler market and are now taking our love of performance expanding it to include the GM family! While we will be offering ground effects kits, vanity gear, etc, our main focus is the heart of your GM, the engine. We specialize in what makes your GM go!

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