I stumbled upon this thread again somehow, and decided it deserved a resurrection because I have made so many further improvements to the 944...
Suspension has come the furthest with Bilstein sports replacing the stock struts, Weltmeister 200lb springs replacing the 1.25 inch higher 125 (i think?) lb springs, 19mm rear and 26.8mm front sways replacing the 14mm and 21.5mm stock items, and a KLA strut tower brace:
And the interior has seen the addition of a MOMO Club3 wheel.
It's looking more and more likely that the interior will see another MAJOR improvement... possibly by the end of the day. Any guesses?