I think there's at least 3 car washes in the BF line.
I don't remember if it works GREAT or just so-so in a foam gun but if you really want FOAM then get a dedicated "foam car wash" and avoid any disappointments.
I've never met anyone that wants LESS foam when using a foam gun.
Yes, the Blackfire Car Wash can be used with a foam gun or foam cannon. I would recommend adding the Blackfire Foam Booster. The Foam Booster will really amp up the foam suds with the Blackfire Car Wash when using a Foam Gun.