I've heard several people say they've run 15.6 with a LS and just I/H/E, and one say 15.5...

I ran a 17.1 on Sunday, but that's at 5820 ft, with heat problems, and crappy launches (2.6xx 60 ft times, but the launches lasted more than 60ft). For comparison, a stock Type-R ran 15.9 at the same track (on a different day; probably under better conditions and launches).

I have beaten cars that ran 15.6 at 700ft, and one that ran 16.6 at the same track. 16.5 was the time I should have run at that track.