If you want to smoke the competition you need to change the R&P and short gears first IMO. Go to Dali's website and check out their tranny swap deals. For $3400ish you can get a rebuilt tranny sent to your door with 4:55 R&P and short gears. This setup will make you feel like you stepped into a different car. You are not going to experience as much bang for the buck as you will with the new tranny. Those other mods are nice, but 8-10 HP from a muffler is nothing compared to screaming through the gears faster than a RX-7 on NOS. Your top end will suffer of course, but I don't know how many times you go 150 plus MPH.
Once last thing. My buddy has the Dali chip, Comptech headers, RM exhaust, no-cats and a 70-shot of NOS, and he dynoed with 10 less HP than my other wise stock NSX; have 70 shot kit only. I had more torque also. Don't ask me why this happended, but you would think that things would have turned out a little different.
The gears will help you regardless of the mods you add on top of them IMO.
Good luck