I have an ATS Xcelerator tuner for sale. Its only been used a couple times. It's labeled to work for 01-08 LBZ-LLY-LBZ-LMM. I had it on an '06 lbz and never went past level 5 or the 7 it has. it has the latest fimware on it. its very impressive and gave me about 2.4mpg increase.
Asking $600 OBO...