I have found 107 to be faster than the spx, however not as fast as the tekin 203 on top end speed., but on initial start torque, faster than spx and tekin

what i would say is aside from speedo/gearing one cannot ignore a good car setup and driving skills, some of the fast guys will remain faster because they are simply very good drivers...

lastly i am sure SP will be coming out with a newer faster software that will compete with the tekin 203.. probably sp 2.1 pro stock and it's software

here is my best 107 setup

ESC: SP GT 2.0 (PRO)
Software: 107
FDR: 104/47*1.9 = 4.23
Battery: Thunder Power 7.4v 40C
Motor: SP V3 17.5R
Track: 100 Foot Straight away total 100/50 foot
SP ESC Timing: 26 degrees
DRRS: 9
Drag Brake: 25%
Motor Timing: 10 degrees
Capacitor: SP Super Cap

if the motor is coming off too hot, i would go to 22 timing on the esc..