what is the difference between the NX 15600 and the NX ICEMAN 15603 purge valves? they cost about the same and do the same i think. which one should i go with?

 

They are both exactly the same except the 15600 comes with a D4 manifold so it can be used with non-NX kits. They both cost the same and the 15600 comes with the extra manifold. The 15600 comes with the same pieces to install it the same way as the Iceman 15603 kit.

 

The iceman purge connects directly to the nitrous solinoid. the NX nitrous solonoid has 3 holes, nitrous in, nitrous out and purge. Most other brands only have nitrous in and out and you use the exra manifold to "T" the purge before the nitrous solinoid.