get a Team Checkpoint mod...
1: Orion V2 lasts longest btw cuts, but its a b!tch to replace the brushes, diassemble, and solder wires to... plus they are suceptable to damage due to physical harm...
2: turn ? what does your track use? 10 min of runtime sounds like tooo much for a mod. not sure about 19t... 19t is for offroad too... again, Team checkpoint makes a killer 19T...
3. If you buy a Checkpoint, theres no need for tuning.. those things are insane...
4. no
5. n/a