When Randy and I installed a Zex kit on his car, we attached it to the backside of the battery try, underneath the intake. Mounted pretty nicely. I think we had to use zip ties though, but i don't remember for sure. It's a nice locations and it means you don't have to run the lines 40 thousand feet just to get it to your intake. that and we didn't have to go through the firewall. At least for the nitrous lines and what not. The wiring was a different and fun story unto itself. It wasn't a very difficult install. Good luck.
Robert
