Just a name. Viper is made by DEI and only sells to authorized dealers, they also make clifford and python. They make the best window module available. I have installed mobile audio and security for many years and DEI hasn't let me down. I can't vouch for other compaines, although they may be good as well. Even though you may find it on ebay, a store would be reluctant to sell you one. They could lose their contract with them or so I was told, just ask around. Buy it new. Anyway, some stereo shop by my house sold me the alarm and window module. If you could get one it's not hard to install. Believe me, toyotas and hondas are cake man. Why do you have your heart set on the 791, why not the 650 w/ RS. Do you need all the aux channels. I considered RS but for safety reasons (manual tranny), opted away from it. I have the 350 with the 530T and it works like a champ. All wires are under the kick panel or under dash.