The venom kit is around $1399. That's insane to pay for a nitrous kit. The zex kit is for beginners. They are both dry (only sprays nitrous) into your intake manifold. The ZEX kit is easy to install and easy to use. I had it but i hated it. It doesn't make the power that it claims to make. I have the Nitrious express kit now. It is a wet (nitrous and fuel) kit. It works GREAT!