My cousin and I left from a dig at a stoplight last nite. He has an 07 nnbs Sierra CC Z71 with the 6.0 and 4L70 (no mods), I just have a cai and a tune. When the light turned he pulled on me until I was just behind his front wheel, but by 40 mph, the 4.8 started to catch it's stride and reeled him in. By 60 mph, his nose was even with my side mirror, and then he let off. All in all, a decent kill from a nnbs rcsb with that little 294ci v8