I did at the track in an actual race, but in a side by side drag race the 2.5 will take any .15 out right now, there is no doubt about that. Like you said racing is alot to do with the driver. Hey I remember you having alot of trouble with your fantom and i had the same. I was wondering if you did reinstall it on your maxx and if it was ok, I have never tried mine since I got it back because I like the AE so much, please let me now.