2009 4.8l ??
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I haven't done a whole lot to my 07 NNBS 4.8, but it moves pretty good. Just modded my stock airbox/filter/Airaid Intake Tube. The stock intake tubes on these new ones are crazy. 3" free flowing exhaust, Wheatley tuning, and a ported TB. The tuning was the biggest thing, although the ported TB seemed to make a noticable difference in the low end power. Which IMO is where the 4.8 needs the help. I would think doing different gears in yours would help a bunch. Mine came with 3.73's.
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I got the 08 NNBS crew cab 4x4 and It is a dog and a gas hog. I have an AFE stage2 CAI and a cat back Flow-Pro exhaust, which did make alot of difference with throttle response. I got EFI Live from black bear performance and haven't had a change to do any logging for him to build me a tune yet. I am new to the tuning so I won't have a clue on where to start. I would like to put long tubes and cat delete pipe on for somemore torque, but $$$. We got the truck to pull a trailer, but it will barely pull itself up a hill. I want a Duramax......
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I got the 08 NNBS crew cab 4x4 and It is a dog and a gas hog. I have an AFE stage2 CAI and a cat back Flow-Pro exhaust, which did make alot of difference with throttle response. I got EFI Live from black bear performance and haven't had a change to do any logging for him to build me a tune yet. I am new to the tuning so I won't have a clue on where to start. I would like to put long tubes and cat delete pipe on for somemore torque, but $$$. We got the truck to pull a trailer, but it will barely pull itself up a hill. I want a Duramax......
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