Right now its ESB for 90% bolt on application, velocity is a very nice kit but the arms arent 100% bolt on.. I do like their upright though, very beefy. However I am quite content with my TC kit also.WILD YOTE said:If money were no option (by the way it is...) what IFS lift kit offers the best flex? I'm talking real numbers like inches of up and down travel. Thanks!