I would suggest reviewing the numerous discussions of the various options in the suspension section and possibly elsewhere in this forum. We do have a search feature you can utilize. Keep in mind that any reference you find to SLR is moot as they are out of business.
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When did you last check your spare tire's pressure?
Calmini's 3" susp. lift is ok. But you have to remove the upper control arm bushings about once a year and clean all the crust off. If not, they make a hell of a racket. Other than that, it's been fine for me for almost 3 years now.