Need a replacement catalytic converter for your 2012 GMC Sierra 2500 HD? MagnaFlow offers high-quality catalytic converters engineered for 2012 GMC Sierra 2500 HD sub-models and engine sizes. We combine efficient design and state-of-the-art manufacturing to meet or exceed required emissions standards. Select your 2012 GMC Sierra 2500 HD requirements and state vehicle registration to buy the best Sierra 2500 HD catalytic converter online that fits your '12 Sierra 2500 HD and meets your state’s emissions compliance.

Need a 2012 GMC Sierra 2500 HD replacement exhaust system? Shop all BRExhaust 2012 GMC Sierra 2500 HD Direct-Fit Replacement Exhaust Systems to find the best aftermarket kit to replace your 2012 GMC Sierra 2500 HD OEM exhaust.

MagnaFlow offers a variety of cat-back and particulate filter-back 2012 GMC Sierra 2500 HD exhaust systems from the Street Series, Aluminized Pro Series, Black DPF Series and MagnaFlow Pro DPF Series product lines. These systems are compatible with Denali, SLE, SLT and WT trim levels equipped with the 6.0L gas V8, 6.0L FLEX V8 or 6.6L diesel V8. Each of these truck exhaust kits are made of aluminized steel or stainless steel and feature either black coated or polished tip finishes. Select your '12 Sierra 2500 HD's sub-model, engine size and vehicle details to shop all available exhaust systems for your truck.