Spring rates are all over the board.
But as for me.
968 Racecar: MOTON SUSPENSION 1000 lbs front 900 lbs rear
944 streetcar: BILSTEIN ESCORT CUP 750 lbs front 650 lbs rear.
SWAYBARS:
968 M030 with rear adjustable to increase/decrease oversteer/understeer
944 "SAME"
BRAKES:
968 MO30 BIG BLACKS (Maximum aloud for f stock racing)
944 (smallest stock brakes I've ever seen but with hawk blues she stops on a
dime).
BRAKE FLUID:
1) Catrol synthetic race ($55.00 a bottle)
2) AP racing 551 or 600 ($16.00 a bottle)
3) ATE blue ($12.00 a bottle)
Leave motor stock and change belts often
Have a serious look at LEDA suspesion form Karl Poetl's RACERS EDGE.
1) I would recommend 20 weekends of track days before going toe to toe in battle.
2) 12 track day weekends might qualify you to race but don't expect to win your
first race.
3) Watch the lines of the fastest competitors including the pros and you will
become fast very quickly.
4) Use the whole track and steer a little as possible.
5) Try to be full throttle on the circuit as long as you can stand it and use the
lowest gear posible upon entry to each turn.
GOOD LUCK.