Well, I rode a fully modded one. It had trail porting, a custom reed-valve conversion, oil injection removed, Fox rear shock, nerf bars, FTR pipe and silencer, FTR clutch kit, lightened flywheel, i think it had a 38mm carb, K&N filter, and some other engine work. It was very fast. It would run with stock Raptors and Banshee's. It had more than $2000 worth of mods, so I don't know if it's really worth it; because for that much you can go and get a Sport/Scramber that is almost as fast stock and then you mod that and it will serioulsy rip. But it is pretty cool to do that to a TB though. I would just put an HPD pipe/silencer and clutch kit to begin with, then start to lighten it up.