There are a number of companies that make long tube headers for LS motors. Hooker, Kooks, Pacesetter and SLP are some. Whether any of them will fit your app is the question. I did a search for you at LS1Tech.com

http://www.ls1tech.com/forums/search...archid=8798505

You might also check out the Conversions and Hybrids forum there. These motors have been put into a lot of vehicles and the exhaust is a common challenge. Some very creative and resourceful people have come up with interesting solutions.

Hope that helps

Pat