I have the Z1 34 row cooler with the thermostatic plate. In the winter time. I put duct tape across the oil cooler.
You need to insulate the clutch line down by the exhaust pipe. Change your clutch fluid. Use Motul 600 or better.
Stainless brake lines will help. When you do that. Change your brake fluid too. Motul 600 or better.
Stillen bars are ok for street and beginner track rat. Once you start getting faster. You'll need a stiffer bar in the front. Most of us use the Hotchkis front bar.
When you start doing all of this. You are going down a rabbit hole with no bottom. Have fun and be safe.