RE: Slash Upgrades
most of the upgrades are not worth it. they are more for durability.
I say u have 2 options....
1, sell it, and get a rc that's designed for racing
2, convert it to a racing truck with 3 easy steps
step one, get a STRC LCG chassis full kit, about $80 (including rustler parts)..... best upgrade ever. makes a huge difference, more than tyres
Step Two, new wheels $30 new tyres $$45.... another big difference.... depending on track surface
Steo 3, New high flow/flo tec body $60 pluss paint. noticeable small difference, mainly on jumps.
Then there are some other things worth looking into down the track. like STRC suspension pins for one, and modifying/rebuilding a few of the stock parts