So I am in the process of putting in my 3.7l (new) out of my 05 GC into a recently purchased 06 Commander. So far I've done a complete new suspension with the Rocky Road spacer lift, new shocks, Monroe platnum quick struts, new control arms, Moog ball joints, powder coated rims matte black w ALOT of clear and HOPEFULLY 265/70/17 Goodyear Duratracts without rubbing..With my stock GC I don't have the power I want and with the added weight and larger tires on the XK I want some more HP. I don't want to go crazy but I'm definitely getting a cold air and looking for recommendations on plugs? Chips? Has anyone had any good luck with anything that they would recommend? I'm new to the thread and it seems to be the only place that someone recognizes the Commander... Any advice out there? It would be greatly appreciated!! Going to check the WTB/For sale because I'm looking for any upgrades to a 06 3.7 XK inside and out...