It's compucar. Never heard anything bad about them, but I don't know if they're in business anymore. The truth is that the only wear item you have to worry about are the solenoids. If you break a bottle, you either had a wreck similar to a train hitting a twinkie, or it got hot. A DOT bottle is a DOT bottle. Lines are standard, wires are standard (as long as it's not house wiring) and relays are good to go as long as they are name brand and not some cheap stuff. So the only real concern is the solenoid itself. I personally run NOS nitrous solenoids for the actual spraying, but I run whatever I can get cheap for a purge solenoid. My theory is if a cheap one breaks, it'll only vent nitrous to atmosphere, instead of venting my rods to the atmosphere 
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