A couple of thoughts:
As a former '99' MY owner I'd suggest the ROW 030 suspension--very cost effective.
Regarding tires and assuming you're on stock 7"/8.5" 17" rims, think about these as alternatives to R comps if you aren't trailing your car:
Nitto NT05
Kumho XS
Hankook RS-3
All can be driven on the street, have way better traction than regular street tires, good for minimum 10-12 track days depending on how bad you beat them up--and best--not real expensive; I think the Hankooks are under $500 for the set--dirt cheap.
A second set of wheels is the way to go, BTW; used boxster style wheels are pretty cheap ($500?).
Last I didn't hear anything about brakes; if you're doing DE's think about a pad for tracking; Pagid makes a few that will work if you use OEM pads on the street.
Same thing about fluid; I like Motul 600
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2013 Boxster S
2006 Boxster--sold
1999 Boxster--sold
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