Just to clear some things up and congrats to Scotty on your excellent times (currently 3rd quickest to date at the strip that I know of). The drag tires that I use do NOT do anything for quarter mile runs except keep things consistent off the line. When the temps drop below 50, stock performance tires are just too inconsistent due to the cold and additional power coming from the cooler more dense air. The biggest factor in my times come from weather conditions more specifically Density Altitude. Check out my 2IS drag strip journal link in my sig for details and if you want I can add your times to the spreadsheet for comparison sake.