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Packbrake Inline Mount 4" PRXB Exhaust Brake For 2001 2005 GM 6.6 Duramax 2004.5 2005 6.6l lly duramax 2000 2006 GMC Sierra 2500 8 FGXX 668603 2000 2006 GMC Sierra 2500 8 grille inserts The spring controlled pressure regulated mechanism on the exhaust brakes protects against engine overpressure PRXB offers the highest braking power to lowest price ratio available
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