They are low mileage SS springs. My stock springs were sagging in the rear so I got these and it picked it back up. I don't think they are any stiffer just my old ones were shot. You can see how my car sits with them pretty clearly in my sig pic. The tire was just about at the top of the fender before and it picked it up about an inch.
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95 Z28 hard top - LT1 | 4L60e | bolt ons | Yank SS3600 | suspension | viking coil overs | 3.42 10 bolt | 3520 lbs - 12.331 @ 108.22mph 1.668 60'
08 Saab 9-7x - L96 6.0 swap | L92 heads/intake/TB | LS6 cam | LS9 springs | 7.425" hardened pushrods | CAI | 1-3/4" stepped LT's | catback | 4L60E | FTI 3000 278mm converter
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