here is GM's site on the engine. 365 hp and 660 torque. Not sure what else is different. http://www.gmc.com/sierra900/1500/index.jsp
From the stuff I've read on dieselplace.com about the LMM, its just the LBZ with the '07 mandated emissions stuff put on it. Scott
with all this emissions junk, how are we gona be able to tinker, and will straight pipes mess up a comp.?
can't speak for Chevy but for the new Fords(08s with the 6.4), any exhaust modification voids the powertrain warranty.
thats going to be for all of them. they will all have about 10 sensors on the exhaust system. so i think were out.