fwiw, here's the top 10 list of duramaxes from Competition Diesel:
1.Banks Rail 7.170 @ 181.08 (4-30-09) - 2290 lbs, Liberty XT5/Molinari Clutch - BANKS
2.NGM Diesel 7.44 @ 187.55 (6-1-13) - 2800 lbs, turbo400 - Johnboy
3.J.Dean's Dragster 7.64 (6-8-13) @ 170.41 (10-13-12) - 2100 lbs, LBZ, powerglide - Stingpuller.
4.Banks Sidewinder Type-D 7.723 @ 179.23 (3-29-08) - Liberty XT5/Bruno - BANKS
5.NX dragster 7.829 @ 172.08 (6-11-11) - LBZ, Powerglide - Johnboy
6.Dirtymax 8.63 (6-16-12) @ 158.23 (5-19-12) - 3268 lbs, LB7, Lenco - ATP
7.NX Mustang 9.216 @ 154.5 (9-18-10) 3600 lbs, LB7, 4L80 - Johnboy
8.Max'd Out 9.360 (10-15-11) @ 149.13 (7-21-12) - 6100 lbs, LB7, Duraflite - ATP
9.bcdeutch731 9.432 @ 148.36 (10-27-12) - 4600 lbs, LLY - Mark at DP
10.Overkill 9.50 (6-23-12) @ 149.51 (5-18-12) - LB7 - Dmitri
(I suppose I fanboy'd myself...)