My car is an 05 ATX. I used a Harlan RPM window switch and a single relay to activate the motor. There are two minor problems I came across when doing this install: 1) You need the intake manifold bolts from a magnum engine, eight to be exact. You can pick these up at any DCX dealership. The non magnum bolts are too long. 2) The manifold support bracket will need to be modified in order to work properly, or you can make a new bracket. Aside from that, everything went very smooth.
Here's a few pics of the old manifold comming off. You'll need to disconnect all the wires on the harness tha runs through the middle of the runners. For me, that included all the injectors, starter, A/C, and something else. Its a pain!
Here is an image of the wiring diagram I used. Because of the way it is connected, I didn’t need a switched +12V source. The down side of this is the fact that the Harlan RPM window switch is always powered on. I’m hoping this won’t cause problems down the line.
Instead of cutting into the RPM signal wire, I decided to add a connection right inside the connector. The connector is a bit of a pain to dissemble, but it looks very slick when its all done.
I hid all of the wires in black wire protector and ran them along factory wire routes. Everything is nice and hidden.
And finally, the relay and RPM window switch. I’m very proud of this setup. Everything is hidden in the fuse and relay center. This thing has a spare spot for a relay and fused power supply. All you need to do is add some wires.
Here’s a photo of the finished product.
Thanks for looking everybody! I’m happy to answer any questions.
My old job was car detailing so I know how to keep the car clean and shiny. I usually clean and shine the engine bay once a month. I got the idea for the polished intake from a guy named Roach. He has a black turbo'd Neon and an intake that looks like glass 
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