I'm assuming with all the goodies that you race? Don't have a RS4-3.
Current stable of R/C:

1) HPI Super Nitro /w Picco .15 SE & novarossi slide carb
2) Trinity Reflex n/t /w Picco .15 RE & novarossi slide carb
3) HPI Nitro2 RS4 .15FE /w Traxxas 6mm rotary carb non-pullstart
4) HPI Pro-3 /w P2K2 Stock motor, Car is mostly stock.
5) Trinity Reflex n/t /w RB .12SE slide carb (my Stepsons car)
6) Traxxas T-Maxx /w O.S. .15CVRX slide carb.
7) Tamiya TL01, mostly stock.
8) RC10GT Team Built / w O.S. .12 CV Hyper (Stepson's car)

The HPI Nitro2, T-Maxx and Tamiya TL01, all belong to my 7yr old son.