I won/bought a new/used set of 2013 BOSS 302 front and rear coils springs and installed them on my 07 GT.....I found them on eBay and won them for $31.00!!...anyways, There IS a difference in these springs from the 07 GT ones... I have them installed with a set of KONI STR-R struts/shocks and GT500 strut mounts...It dropped the front and rear a half inch and the spring rate is much better.. It has a better ride and handling is improved as well... Also there's less squatting in the rear.

So I thought I would pass along this info for those of you guys that want a better ride and don't want to spend a ton of cash...It saved me $200.00..
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