I am looking to find an aftermarket muffler for my 05 LLY. Can you tell me what you are using? Is it a direct replacement? Thanks

http://dieselplace.com/forum/showthread.php?t=31359

Not really aftermarket but it gets the job done. Things like this are too cool in my opinion.

I removed the stocker and put in a 3.5 dynomax . looks the same as a magnaflow. it's not very loud but brought down the egt's and spooled up the turbo a little faster.