I have a 91 Miata that I've owned since 1999. The car was bone stock but it's undergone some changes since then.
A Racing Beat half-nose was added first.
I ended up getting a VIS side skirt next.
A Wings West rear bumper and rear spoiler complete the body add-ons.
Additional exterior mods include:
a) Rota N1R with Kumho Ecsta tires. Tires have decent grip and great value for performance. The rims are heavy, but I believe I was one of the first to get it (bought from the distributor) in the US.
b) RB Type II style bar, custom windblocker and RB rear deck. I wouldn't have gotten the style bar had I known what I ultimately wanted to use the car for: some track time. I'll sell this unit at some point, and hopefully find the guts to cut my rear deck to accomodate a rollbar. I've just recently installed a Hard Dog Sport Single Diagonal Bar for Thunderhill. Fun!
c) Classic fuel lid
I bought this from Leni Metro used. The suspension was great out the box, but I've upgraded to Eibach Pro Kits, Koni adjustables and RB sway bars. 
This is how the car looks like when I take it to rare autocross events. SF SCCA requires membership to participate, and you only get three runs at that. My membership has since lapsed...
Where do you get these, anyway?
