Replace that restrictive factory downpipe with a MBRP direct replacement downpipe for more flow, fuel economy, and better performance. Removal of OEM catalytic converters may be a violation of emissions laws in your jurisdiction. Ensure that the intended use of this product is permitted. Not for sale or use in the state of California.

This Part Fits:

Year	Make	Model	Submodel
2015	Chevrolet	Silverado 2500 HD	High Country
2011-2015	Chevrolet	Silverado 2500 HD	LT
2011-2015	Chevrolet	Silverado 2500 HD	LTZ
2011-2015	Chevrolet	Silverado 2500 HD	WT
2015	Chevrolet	Silverado 3500 HD	High Country
2011-2015	Chevrolet	Silverado 3500 HD	LT
2011-2015	Chevrolet	Silverado 3500 HD	LTZ
2011-2015	Chevrolet	Silverado 3500 HD	WT
2015	GMC	Sierra 2500 HD	Base
2011-2015	GMC	Sierra 2500 HD	Denali
2011-2015	GMC	Sierra 2500 HD	SLE
2011-2015	GMC	Sierra 2500 HD	SLT
2011-2014	GMC	Sierra 2500 HD	WT
2015	GMC	Sierra 3500 HD	Base
2011-2015	GMC	Sierra 3500 HD	Denali
2011-2015	GMC	Sierra 3500 HD	SLE
2011-2015	GMC	Sierra 3500 HD	SLT
2011-2014	GMC	Sierra 3500 HD	WT