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on the WOT switch the bottle must be open, the activation switch must be on...then.. at WOT he juice sprays. so just keep the switch off until... then flip it.since you live in NY you will need abottle heater. looks like you have an A4 so no window switch.a fuel pressure hobbs swotch and thats it. BTW, GET THE TNT KIT. :smash: :smash: :smash:
Some other nitrous parts you may want.
Bottle opener which lets you open/close bottle from inside the car.
Electronic WOT N20 Activation switch. Throttle body is electronicly controlled. You could have throttle body closing even with pedal to the floor and N20 spraying. Traction control condition will shut throttle body with pedal still on floor.
Purge solenoid.
Fuel pressure safety
MSD window switch. Allows N20 to be sprayed only in certain RPM ranges.
Your system will come with an on/off arm switch. In the off position you will have no spray of N20 at WOT.
Matt of http://www.exit28motorsports.com has NX Express N20 package kits with all the add ons.