DREMEN: i use stock suspension and i think lots of ppl think its the best
-well if u use aftermarket e.g Bilstein shockies+springs, u better get rear camber adjust if u lower ur car(skyline's dont like lowering,wrong camber will cause excessive camber hence wheelspin)
-pineapples to reduce axle tramp
-anti lift kit perhaps?
(the stuff i said above was quoted 1200-1300 for me)
p.s i seen a few ppl using "drift" suspension and getting terrible times