do any of you guys have experience with these coilovers? they claim they can do custom Valving and Spring rates for you. The car im putting them on will see mostly street driving and ocasional Time attack / road racing. ive been considering them, for the price of $999.00 shipped. what do you guys think? what spring rates / valving would you recomend? they will be going in a 1995 Nissan S14 with an SR20 simple, GT2871R Set up, Whiteline subframe, differential and suspension bushings. and all the SPL multy links.