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I have my ground control coil over on my stock strut/shocks for about a month now and I lowered my car about 2 inch. And this past few days I heard a squeking sound on the left rear tire. Is this a sign of a blown strut/shocks.

And one more thing Is Koni Strut/shocks will fit on my Ground Control coil over without modification? Do you have a DIY for that?

 
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The squeaking is not a sign of a blown strut. Probably you just need to grease up the urethane spacer that sits inside the sleeve. If you decide to go with the Koni's, I recommend that you have them installed by some pros. I posted installation instructions on the Tech forum a while back, you can see how to do them yourself if you want. (Do a search under my user name 0100010)

I've got the GC/Koni combo myself, I love it. Only other thing you need to order are the adaptors from GC for like 11 bucks each, for the rear struts.

 
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Alright Thanks dude Ill check it out