So I got around to install the seats and harness. I decided to not use the sliders, but to just mount the seats in a fixed position. I tried many different combinations for the install, but this is the lowest and furthest back I can possibly do with Sparco base and side mounts. Im 6'1, so I need as much room as I can get in the S. I removed the bottom cushion from the seat and have plenty of head room, so this method will work just fine. The difference in driver feel is night and day. I can really feel how well the S2k handles, now that I am fixed in one spot without any side-to-side movement. Definitely will make the track events more fun!
Here is some pics of the new OEM AP1 spoiler. Looks a lot better now IMO.