Originally Posted by Rapid Roy
He was asking the manufacturer of you car. The body really makes no difference. You can change the body any time you feel like it.
Sounds like the "HPI" Nitro RS4-3 RTR version w/ m3 body. Its actually a very versatile car. Good on the street (shaft so no rocks get stuck in the belt). Good clearance and good enough to get started with racing.
If you want to make a nitro car faster , thats probably the easiest thing you can do. Want quicker accel , get shorter gears , want more top-speed get longer gears. The longer the gear wont bge the ultimate trick to top-speed you will also want a strong motor to propel it quickly.
If anything the worse mistake I made as a new nitro driver was trying to get my car to go fast. I bought a tuned pipe and header , which helped and did a bunch of things , got new motor and such. It was definently faster , but its really no fun.
I at least got an upgraded brake and so forth. But you should probably look into the hpi competition aluminum shocks...and if they are out for that car , not sure....get cf shock towers. These usually come with more shock positions so you can play with tuning. Get like a cf deck and look into making things easier and cheaper on yourself. Like getting rechargable batteries and lightweight battery packs.
Also look into the super chassis from hpi or other aftermarket companies. This will offer a lighter chassis , which will do 2 things. Make the car quicker and make it handle a tad better.
I would also look up the hpi rs4-3 thread im sure there is one or do a search on rs4-3 and see what mini threads have been created already and do as much reading as possible. Lots of smart people out there have your vehicle and have done lots of things to it so you dont have to go out and buy things without knowing if its well worth it.
Good luck , happy tuning.