If you did not buy this car to be a daily driver I would go all out with a track car theme. I'd widebody it, coil overs and consider turbo or supercharger. Engine oil cooler is a must. The auto is computr controlled and revs when you shift but isn't truelly a rev match trans. You got the limited slip rear with your sport touring, good job. I would look into brake discs and pads and stainless brake lines. Good luck, oh and if I didn't say it before
BTW these are some of my mods, see signature below.