Here's what I do in addition to what you mention. I'm certain others will have more feedback
- All cooling Hoses, check age condition of radiator.
- Check power steering reservoir, replace if necessary.
- Flush brake fluid, get track/Autox streetable pads (i.e. Hawk HP+)
I do SS brake lines. - Assess suspension for what you want to do. I run coilovers
- Front xBrace, rear strut bar, then front strut bar.
- FOGG front airbox
- Freeier flowing exhaust
- Consider a Z3 steering rack, (there was a Z3 at San Jose Pick n Pull last week)
- Nice light wheels with appropriate tires.
- I install wheel studs for easier wheel changes
- Light bucket seat w/4, preferably 5 point harness
- Tow eyes or straps
- comfortable SA2015 or later helmet
Have fun, perhaps I'll run with you at a NorCAL or SoCal event.
Cheers!