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Originally Posted by ArthurS
Do not go with a non-name brand. 2 out of 3 of those ebay auctions are junk. If you are looking for springs, go Perrin, TEIN, Prodrive, Eibach, or STi (I am sure there are more name brands).
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...and Hypercoil, QA1, H&R among others if you're looking for standard dimension coil-over springs.
My advice would be to look for manufacturers that guarantee their spring rate control, for example that any spring you buy from them will be within +/- 5% of the published spring rate. The good mfr's do this, some others don't... if they don't then you don't really know what you're getting. They might advertise a 350lb/in spring, but the one you get in the box might actually only be 322 lb/in. I know Hypercoil in particular guarantees their rate control within 2%... of course their springs are also pretty pricey.