Stay away from RC ... I have the 2.5" Springs with the performance 2.2 shocks and its been a head ache... ride was good for a week or so then get a little bouncy, come to find 3 of the 4 shocks were leaking badly. I called and got replacments overnighted for free, two weeks later had to make a call because of the rear shocks leaking once again ... they overnighted and I just put them on Wednesday. If these leak they committed to a full refund and ill keep the kit, so basically I am saving for a new lift! On the other had my brother in law with a TJ has a 4 inch RC lift and has had no problems in the 30k miles that are on it .... i was told by the guy from RC that they had got a "Bad Batch" of shocks and they thought they had them all filtered out ... guess not ... I hoep this helps but listen to these guys ... take your time and save the extra money and do it right the first time ...
I hope this helps ...
Tabers