Stand-alone fuel sys. or not?

Sorry, I'm not a newb to modded busas obviously, but i'm a newb to nitrous on bikes...This is my 3rd busa and my first N20 bike. My bike has a direct port (fogger) kit installed on it, all except for the fuel system. Currently its running stock intank pump and etc. My question is this: I want to use the N20 soon, and would like to know if I should or should not tap into the stock fuel supply line. I've heard that running a stand-alone fuel system for the nitrous is the best way to do it, but I don't really have the room, and it would be so much easier not to. I'm open to suggestions, what should I do?

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