So I just ran my brother's 01 sclb 4x4 Duramax and it didn't go so well. The first race he had the 65 hp tune in. He ran in 2wd with a moderate boosted launch and jumped ahead about 2 lengths right away. Once I finally hooked up, at about 15 mph, I could almost hang with him, but he was still slightly pulling. The second race he programed in the 90 hp tune and did a very agressive 4x4 boosted launch. Needlsess to say he instantly jumped about 5 lengths and then he just kept going and going and... My truck is still 100% stock, but I thought I might at least keep up. Oh well, I guess that's incentive. Oh and to make sure I continue to have traction problems, I filled up that empty spot behind the passenger seat.
On the plus side, I did beat my dad in his '96 454 2wd Suburban!