AFX G-Plus – HobbyTown has a small stock; usually have some good cars.
Not as pretty but supposedly higher performance cars: Vipers; Wizards.
The chassis can actually be used under Mega-G bodies.
IMHO – the AFX G-Plus are already pretty hi-performance – esp. for a relatively short track – but Do handle better with the O-ring Front wheel-and-tire sets (to prevent braid lifts and hence dead spots).
They both also sell AFX G series compatible parts and tools.
"... get on your bad motor scooter and ride!"
Sammy with Montrose