From what I've read, I wouldn't go over a 2.5in level. You can get your 3.5in of height in a variety of ways. RC has a 1.25in body lift and zone has a 1.5in. Add that with 1.5in, 2in, or 2.5in level and you can get a variety of sizes of total height. The shop that I go to quoted me for either body lift kit at $550 for the kit and install. RC also sells them as a combo lift at either 3.25 or 3.75in.