RE: N02 Options
I'll begin with a quick fix...
It's N2O...ok now that's clear...
There are many companies that make kits, and honestly they all make a kit that will fit a V6 nicely.
If you have a Return Systemed car, you can use any of the Dry kits, and if you have a Returnless system you'll need a wet shot, or the Venom dry shot (which is pricey).
Common companies people with cougars are getting:
Zex
Nitrous Express (NX)
Venom
NOS
There are other companies like:
Nitrous Works
Compucar
Edelbrock
etc