The GMT900 platform made its way to GM's HD series trucks for the 2007 model year. With it came major upgrades inside, outside, and most importantly, under the hood. The base engine became a 6.0L LS-based V8 producing up to 360 horsepower. For 2007-2010, the 6.6L LMM Duramax was the line-topping diesel, and it was superseded in 2011 by the LML, which provided 765 lb/ft of torque in stock form. No matter how you put your HD truck to use, we have the parts to make it perform better.

Holley is home to some of the top-performance exhaust brands in the world. Brands like Flowmaster, Hooker BlackHeart, Hooker Classic, Flowtech, APR, Dinan, and Flowmonster combine to cover thousands of applications and a variety of budgets. Whether you are putting a full stainless steel exhaust on your late-model muscle car or if your rat rod needs a set of Lakester headers, Holley’s exhaust brands have you covered.