Even if you have the the stock non "pre run", remember that it is still shimmed for 30% nitro.I have about 2 gallons on mine and it just really came to life last week. I run the Ofna 086 pipe and can make a 20 minute main on 1 pit stop, barely make it, but make it...Just be careful not to clutch it too lightly,with all the bottom end it has you can find yourself pulling triples that don`t exist! lol