An exhaust is one of those essential things that every Duramax LB7 needs. It opens up the the exhaust and lets your Duramax LB7 breath like it should have come from the factory. Add to that tips, manifolds, uppipes, or stacks and you have yourself a real head turner. These systems help cool EGTs and reduce spool up times for the turbo. Great upgrade to help that engine last for years to come.