New Question on Springs

B/c of the low offset (+35) on my 17 inch rims- I have to remove my rear eibachs. I'm going to leave the front ones in b/c I don't have a scrapeing problem with them.
I don't want to reinstall my old 14 year stock rear springs and was wondering if there were any better performaning sock height springs available for my g1 coupe- or am i stuck with OEM?
Do all perfomance springs lower a car?

Any answer is appreciated- Even "I don't know"

Esti