I’d start with some front brakes first. There’s no way you can stop good enough going any faster speeds.Then you can get more performance mods.Safety first always. Expansion chamber (1)nasty jack ,(2) mz65. Those are the two best for the money and easiest to install.. There’s other good ones too. Port matching and porting cylinder is the right with pipe, jetting. There’s more but that’s a good start.