Pro Parts Exhaust

To use an aftermarket system on LT headers without swearing and having to do a bunch of modifications, the header collectors needs to point straight back and be pretty darn level. If yes, then you still have the problem of clearance over the axle with 3". Pypes makes a 3" hybrid system that is 3" X or H kit into 3" mufflers into 2.5" tailpipes which is a good match for your application.

If the collectors are at an angle or pointing downward, you can still use a pre-made system. However, you'll have to make custom collector reducers to get you back in line with the crossmember humps. The more crooked the headers are, the trickier the custom work becomes.