I added long tube headers, K&N cold air intake and an ECM tune via EFI Live on a 5.3 Suburban. Night and day difference, I can easily brake-torque my 285 All-Terrians and I have to watch the gas in the rain. It used to die at 80, now it pulls hard past 100. The headers made as much of a difference as the tune. By the way, I am still running stock exhaust. The truck is so much fun to drive now that I have a hard time keeping my foot out of it, which doesn't bode well for my transmissions, yes plural, as in too many.

A tune with Black bear or Hypertech, aqnd an exhaust system- full dual- will make a big difference. The 6.0 is a stout motor.

Wannabe

I've only seen one "full dual" exhaust on one of these trucks it was custom made and didn't make anymore power over a single 3". Justin does very well with the tunes especially when you data log it with efi live and send him the log file. Disabling the torque management and turning on the power enrichment from 1 mph really wakes these up. The sky is the limit. I worked on one that had angle milled dart heads, cam, rockers, edelbrock intake, long tubes etc. made over 450rwhp but it wasn't exactly bolt ons and the guy was well over 10k deep. Do the tune and call it a day if it were me. Actually that's what I did with my work truck lol

You are going to have to backup that statement. More air and fuel if burnt properly means more torque. Yes you will be able to move a given load faster in a given time. Same load in same time = same fuel

2500HD's come with e-rated tires, wider than stock or taller than stock will hurt your fuel mileage and performance

Black Bear is the best but I must say...Super Chips Program out of the box made a BIG improvement in my '05 Escalade LQ9. With no other changes mine pulls away from my friends stock 6.2 2007 and tops out at just shy of 130 on the topside.

Jesus, 130mph in an Escalade? I don't like doing 130 in a Vette.

C'mon joe!! Grow a pair!! Lol I've got a data log somewhere from my diesel at 148... Had to lower it, rear tires kept coming off the ground over the slightest bump

lol, you guys are crazy! Then again, Im from Chicago, and most roads around here you're for sure gonna hit a pothole at those speeds and blow a steer tire.

Just wanted to say thanks for the input. Not sure ill be able to tow the boat at 130!!! lol.... It would be great to have some extra grunt rolling down the highway! Merry Christmas! I hope Santa brings everyone some new toys for the boat!

a mexicen blasted the side of my burb a few years ago and took off..i had the donzi on the back and i was chasing him down on rt 59 @ over 100 mph pulling the boat..plus i was on the phone with the cops,,needless t osay they got him and what a first no licence and his friends car..but i got lucky,,he had insurance..that is a first..