I finally heated up my tires longer and was able to really stick well for two 8.0 et's at the 8th mile, but only trapped a best of 12.4 @112. My car has never been the same, ever since I took off the resonator and stock muffler. Sometime this Spring I'll go back to a nearly stock exhaust, just without the rear cats, the way it was when I was trapping 12.1's @114 mph. The re-tunes have not worked at all. Glad to see that Paul is able to use those 315's on the Voxx's, so I'll have to look into that setup next.