Description: This FLO - 664NM exhaust system is a perfect fit for 2011 - 2015 GM vehicles with a 6.6L Duramax engine that has a V - band flange at the downpipe. Flo - Pro Exhausts are designed to fit all wheelbase and cab configurations unless otherwise noted. This 5" downpipe - back exhaust system is ideal for those who want to replace stock components with high - performance and high - flow 5" piping. Like all Flo - Pro exhaust kits, it comes with all necessary clamps, pre - weld contour bent hangers, and stronger flanges for an easy installation. You'll enjoy improved fuel mileage, increased torque, and a better - sounding 6.6L engine. Features: 5" downpipe back race exhaust, no muffler (straight pipe), increased torque and fuel mileage, available in aluminized steel and stainless steel, no bungs, single side exit. Notes: Some 2015 models have a 3 - bolt flange on the turbo direct pipe instead of a V - band clamp. This kit only fits models with a V - band clamp and won't work for trucks with a 3 - bolt flange off the turbo direct pipe.

Using this exhaust system is quite straightforward. First, make sure your vehicle is a 2011 - 2015 GM with a 6.6L Duramax engine having a V - band flange at the downpipe. Before installation, check all the components in the kit, including the clamps, hangers, and flanges. During installation, follow the instructions that come with the kit carefully. If you're not confident, it's best to get a professional to do it. When it comes to maintenance, regularly check the clamps to make sure they're tight. If you choose the aluminized steel option, keep an eye out for any signs of rust. For the stainless steel one, it's more resistant but still needs a general inspection. And always remember, this kit won't work on 2015 models with a 3 - bolt flange on the turbo direct pipe, so double - check your vehicle's specifications.