I have a Viper 5704 installed in my s2000 with tilt sensor, backup battery, and proximity sensor. For added security measures I'm thinking of adding a glass sensor, piezo siren in the interior, and an extra siren in the engine bay. I noticed that the siren in the engine bay is not hidden and wanted a 2nd one hidden plus it would make the alarm more audible. My question is should I just get an extra siren or go with the backup battery siren (viper 515r)??

Thanx

 

I would never have a siren in plain sight in the engine bay. The glass sensor is really not needed unless your really in a high crime rate there there is alot of break and grabs. I rarely use them.