I want to install a wet kit on my Ion. Some fuel rails have a place to insert an extra fuel line for a wet system. Mine does not have that. It's the rounded looking one. Can I "t" it off from the fuel line before the injectors? How is the best way to install it with out hurting the FI system?
Q. How easy is it to install a basic wet nitrous system?
A. The NX "Stage One" EFI System is very straightforward. It requires no engine disassembly, no fuel system modifications or timing retards. Simply install the "Shark" nozzle in the intake tract approximately 2-6 inches in front of the throttle body and connect the fuel solenoid to the high-pressure side of the injection rail and your ready to go.
This is taken from here http://www.j-body.org/forums/read.php?f=39&i=9545&t=9545.
It's not an Ion, but the basics are the same.