One last thought, is an S2 cab the car you really want to start down the slope with? Shameless plug not intended but you might be better off buying a 944 spec or my turbo and selling the cab if you really enjoy the racing. Cheaper and easier in the long run. Ask anyone, buying a racecar is much less costly then building one.
Jad couldn't be more correct. I spent $5.5k to buy my 944. I spent another 5K to 10K to get it "track ready" as a street car, with some very, very nice improvements. I sold the car for ...... OMG .... $700.00 less than I paid for it.
Things I now know not to build myself (and will buy fully set-up next time):
-Race car/track car
-Boat. Any boat systems.
-911 Engine cooling system (ask me how I know

)
-Electrical systems (only job I had where the guys called me "shorty."

No; it wasn't about my height.

)
-Business phone systems (Hello! Can you hear me now?!? F@#$%!!!)
If I were to do it again, I'd buy a fully sorted 944Spec or Jad's ride for a fast, inexpensive hootin' good time at the track. If you guys haven't slid too far down the slope, I'd say "stop the belay", and go find a 944Spec car (or ... gasp! ..... a 911SC) for around 12K to 16K and go have a great time on the track. To really set up a 944S2 Cabriolet, you'll wind up spending near the cost of a 944Spec car in parts and labor to really do it right.
BTW: No one mentioned it: the "more aggressive" seats have less bottom-padding and can be b*tt-Numbing on a long freeway drive; requiring an extra pillow down-below for the
rumpis-numbness affect. If you drive long-hauls, be prepared to augment the seat cushion on the bottom. And ... would you really want to jostle and bound across-country in a loud, cold (or hot), b*tt-numbing "racer cabriolet"? Just a thought.
