Has anyone heard of or know about the nitrogen kits you can buy to fill nitrous bottles with nitrogen to help maintain consistant bottle pressure? Can anyone explain it or gimme a link with more info?

 

They're called "pusher" systems and I believe are illegal at NHRA sanctioned tracks.
Nitrogen has a higher proof pressure than N2O and could potentially rupture the N2O tank killing you and others. Are you racing Pro Modified?

Nitrogen gas is plumbed into the top gas space of an N2O bottle. The inert nitrogen forces the nitrous oxide out of the sipon tube at a constant pressure. This allows more nitrous oxide to be used before the bottle needs to be evacuated and refilled. The n2o bottle will need to be completely emptied and preferrably vacuumed down at refill.

 

Naw, just looking into an option of keeping the pressure consistant without having a heater drain the batter. Thanks for the reply.