Nos kit or Kyro kit

[Goat Blower]

You don't need a purge if you're spraying the intercooler, unless this is just for looks. If that's the case, you should probably get an electric blow off valve from Ebay as well. Makes cool swooshing noise.

[tim]

I am guessing that Co2 would be a lot less expensive then nitrous oxide. Maybe not though? Similar effect too with what you want to do with it.