Im not running Nitrous yet but from the installs I have seen most people have been jetting just before the throttle body. Usually they tap into the TB elbow.
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V8 SLAYR
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Jeff Peterson - 2006 GTO - Cold Air Inductions CAI, SLP U/D Pulley, FAST Ported Intake, Ported TB, Kooks 1-7/8's, Spintech Mufflers, H-Pipe, Yella Terra 1.7 Rockers, Flowtech Hellion Cam, 255lph Pump, and GMM Ripshifter. 445rwhp 402rwtq SAE