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Haha I should have told you this, I ran into the same dilema. The 03's fuel system is returnless so you need a NX Fuel Rail Adapter. Try summitracing.com for the best price, or check out our sponsors. It's like 50 bucks, and its simple to install.
Some have them and some don't, i am not sure if there is any rhyme or reason to it. if you do not have one then you will need the fuel rail adapter to install nitrous, fuel pressure gauge, etc.
It would be much easier to just get the fuel rail adapter, removing the fuel rail isn't as small of a job as the fuel rail adapter, trust me!!! just spend the 50 bucks.