I'm looking at a set of D2racing coilovers, and you can actually custom order the spring rates! Stock is 13kg/mm and 7kg/mm front and rear, I was wondering how would 13 and 9 handle? what about 15 and 11? or even 15 and 13? Tein Flex is 16 front 12 rear, and it's not really that stiff in the front. I'm more concerned about the big 4kg/mm gap between the front and rear though (the car might understeer too much).

Give me another week or so until I get the testing done with and then I'll post up the results.

did you buy those sets from kyle98gs? if they're new what's the spring rate front and rear?

btw, these coilovers strut height adjustment does not accept spring rate pre-set right?

ok i'm going to try 15kg/mm front and 11kg/mm rear. Question now is if i'll ever be able to find a set like that on the classifieds.

No, I did not buy these coilovers from Kyle98gs because he had the old design that had some faulty problems to it. I'm in the process of installing them now and will do a full writeup soon enough. I'll answer your question by the end of the week. But I highly suggest that you hold out on order the coilover with your spring rates unless you put the shock and springs on a dyno to test them out, which I did.