I would recommend the K-Maps remap. It will add about 10% more power. It will not really make the car faster but will noticeably improve initial acceleration (much smoother) as well as improving the flat spots around 4-5K (at least for a 135, not sure if this will be different for a 160). It makes a noticeable improvement in the overall drivability of the car in my opinion. Easy to do as well.
I do not have much experience with the other items you mentioned. The brakes on the 160 are already good and are significantly larger than the standard brakes. My car came with an upgraded exhaust, so I cannot say how it compares with the standard one. I get the impression that upgraded exhausts have more to do with sound than power for most cars.
The rev limit on a TF160 is 7200. How much higher do you want to go?
