1st: Spider diff. mod: In the middle of a race, it sucks when u only have fw drive
2nd:Motorsaver Air Filter: Cheap insurance
3rd: 6volt hump pack/5 cell: more power to the servos= more torque, quicker
4th:better Steering Servo/ maybe 645mg hitec: this is decent for torque, cheap
5th: Dual Disk Brake kit from hpi: stock brakes suck, these are overkill
6th: shave c-hubs for better steering
If u plan on racing, then come talk to me, i am a pretty diehard racer and believe the savage can race, i actually win most of my races, lost 1 time to a pro driver tho, but i beat him the 1st time. Goodluck