06 2500HD 6.0L 4 wheel drive. yes can only go about 280miles on a full tank if im lucky. so its roughly 10 something a gallon. I have a few questions, does the nelson tune void warrenty? and is it worth the money, will i see a gas milage inprovement, and do throttle body spacers make alot of noise as of a whistle noise? is it loud and annoying? D.J.

 

Im not sure if the Nelson Tune voids your warranty but if something happens and you need to take it to the dealer then, im pretty sure that Allen Nelson would program your pcm back to stock so that you won't have any problems. As for the tbs, it's not that loud, you can hear it slightly over your exhaust at WOT.