Contour Enthusiasts Group Archives Forums Modifications Forced Induction Nozzle Placement

Just far enough back to get a good distribution of N2O and fuel before it hits the divided upper intake plenum.
I think after the throttlebody is too close. In the accordion or in the outlet of the maf sounds fine for a basic kit.

If you wanted better performance you could run dual nozzles, one in each inlet of the manifold right where it splits. This keeps less thermal expansion from the N20 heating up outside the manifold and will equally divide it between banks. It would be more efficient on all fronts.
Instead of one 75shot nozzle you can run twin nozzles with 35 shots and drill them into the manifold right at the corners. Make sure the lines going to each nozzle are exactly equal in length for both fuel and N20 as compared from bank-to-bank, and as short as possible.

Don't forget the bottle heater, fuel pressure cut-out safety valve, and probably a electric cut-off at the bottle for the best safety.