I have a 2000 Boxster S main cabin Wiring harness available and ready to ship.
It's in great condition with all wirings intact.
I believe 2000-2004 are using the same harness. (maybe someone here can confirm).
I bought it by mistake for my 98 986 (was sold to me as 97-99).
Paid $200 for it, yours for $150 with ground shipping within continental US included.