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IPI Auto Parts -->Genuine GM Exhaust Muffler Kit 84964739Product Description Give your Sierra increased horsepower and a more assertive sound with the GMC Performance 5.3L Short Wheelbase Cat-Back Dual Exit Exhaust Upgrade System. This exhaust system offers an increase of up to 10 horsepower and 6 lb.-ft. of torque, while reducing backpressure by 41% at 300-g/s, based on correlated flow testing. Designed and validated by GMC Performance engineers, this 304 Stainless Steel Cat-Back System is tune...

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