I've been ridiculous enough to my street 300 that Alex found fit to comment on it. The only thing I haven't really touched substantially is the engine internals.
Saturn's upgrade list, to the best I recollect and I'm positive I'm forgetting a bunch:
Wheels: powdercoated for the pretty
Suspension: Completely replaced with Ohlins setup, front and rear.
Brakes: braided lines, aftermarket rotor, HH pads, etc.
Ergos: Pazzo levers, Moth rearsets with lightech folding pegs, Corbin custom saddle/pillion, grip pads, woodcraft clipons, replaced steering head bearings
Electronics: aftermarket blinker replacements, security system/tracker, DaVinci dashboard
Air: replaced airbox with pod filters, AreaP exhaust, retuned engine controller
Tires: generally run Perelli Sport Demons
Battery: AntiGravity ReStart, wired for battery tender/accessories
Other bits: fender removed, carbon fiber body work, purple double bubble screen, chain replaced
https://www.instagram.com/p/Bwinn1flocg/ is probably the most recent photo I have of this specific bike (been spending more time on my BMWs recently)