How and where does anyone run the main line from the bottle to the engine bay.... Under car under interior pieces ...? Thanx in advance John

 

I ran mine inside. If I had enough line, I would have probably routed it outside.

 

Inside the car. From the spare tire hole under the carpet to the hole in the fire wall behind the computer.

 

I just posted in your other topic. If you are mounting between the seats, go through the hole under the driver side rear seat like I said. Then you can tie wrap to the brake line and follow that to the front. Put it behind the heat shield by the exhaust manifold and pull it right up to the engine bay. That seemed much easier to me than pulling up carpet or forcing it under trim pieces. I also have heard that you may not pass tech if the line runs in the passenger compartment but I don't know if that is true.

If you decide to run it inside the car, definately use the grommet behind the computer. Also use it to run wires. I didn't know about it and ended up drilling my firewall for wires.

 

Oh, come on, why would you run it outside, under the car?!
I have routed it through the passenger side door jamb molding. You don't have to drill any holes, you can poke it through the opening for the computer harness. The whole main feed line routing took me about 8 minutes!

 

under car, along the brake lines, took a lil more time but if some thing were to happen to the line(not saying it would) id rather it under the car and not leaking laughing gas into the cabin of my car!!

 

From what I understand, according to NHRA rules, the N2O feedline must not enter the cabin. I ran mine under the car and it reaches just fine.