ok what a i missing
First the fuel system is going to need some help. The best thing (and maybe the cheapest) would be to build a stand alone set up for your nitrous system. If you really want to try a pull fuel off the rail for a 200 shot you will need an intake pump, hot wire kit, and you are going to want to eliminate the stock FP regulator in the tank and put an aftermarket one at the rails running a return line back to the tank (racetronix makes kits for all this). If you don't relocate that FP regulator you are going to get a nasty lean spike when you first hit it.
Secondly tuning. If you have no way of tuning the car yourself via HPTuners or Edit, invest in a wideband (like the LM-1) and a timing tuner. Also pick up a Scanmaster if you have no other way of watching for KR. Those will probrably be your best tools for tuning fuel and timing.
Lastly, I probrably wouldn't be caught spraying a 200 shot on pump gas, I'd run atleast 100 or 106 octane.
BTW: The TR55s are not going to cut it, your going to have to go atleast to a TR6.

