What was the temperature? What kind of 60' did you run and what tire, rim size.
I went out with my stock srt with 285/35/18's super sports and cut a bad 2.0 60' and ran a 8.5 in the 1/8th but it was at least 90degrees and very humid.
The other srt ran with a code 3,tune and 275/35/17's a 8.2 1/8th and a 12.5 1/4 mile. the best itsrun is 12.2 on ps2's.
Weather has a lot to do with the times so I would wait till it cools off and beat you best times then