NOS is a blast, spray away!! I would say start with the 50HP hit and not to go over 100HP, but a call to Nitrous Oxide Systems to get their recommendation on the level of hit would be the best.

Of course a 10 pound bottle would fit in the back I would look at hiding a sneeky pete bottle some where out of sight. You also may need to upgrade the fuel pump and ignition. P/M me if you have any questions