Has anyone had any experience with putting any of the various lowering modules out there on the RRS? I've seen some previous mentions of Startech, Cargraphic and GAP. I was planning on doing the Renntech module but the GAP system with programming through the ODBII (as well as having the other diagnostic capabilities) made me choose that route. Haven't received it yet, just curious if anyone else has experience or advice to offer. Thanks!