better to drive it for a while and then modify it. that way you will know exactly what you want to modify. You may find that you want to improve handling ie. coilovers and braking before changing the powerband on an already powerful engine. also i dont see improved tires in your list, and tires are the most important performance upgrade. Also, the automatic transmission on the tl-s shifts in .9 seconds, why waste upgrade dollars in chipping out an already class leading tranny. Sometimes more subtle modifications will provide more driving satisfaction. The tl-s is a great car, but a little on the heavy end of the spectrum for a sports sedan. Maybe performance bushings and a larger diameter rear sway bar, and the same treatment on the front would give better results.