Hello and welcome to the forum.
Ya for GM pretty mutch if you take the mudflaps off your possible to void the warranty. Your best bet for power is to get a programmer and a intake. The new emissions filter on the exhaust is pretty hard to get around from what Ive heard.
I forgot the abbreviation years but a LBZ is 06-07.5 07.5 and up is the LMM.. I stole this info from another thread
Quote:
Originally Posted by ob_1jr  Thanks to 05_LLY
8th Vin #1-LB7 300 hp
8th Vin #2-04.5-05 LLY 310hp autos only, 300 hp manual trans and 4500/5500
8th Vin #3-06 LLY ratings are the same as vin 2
8th vin #D-LBZ 360 hp auto only, not an option in manual trans or 4500/5500 trucks> |