-on the firewall ( on the plastic cowl cover/panel), next to your brake booster.
-where your battery used to be, if you have it in the trunk
- where your airbox used to sit, if you've gotten rid of it.
- inside the car, under the pass seat, if you feel like running the wires through
- inside the car, in the glove box, if you feel like running the wiring through
- inside the car, under the dash, on the floorboard
Just keep the thing away from heat, if at all possible.. they dont like extreme heat!