Unitrols are nice, but the newer ones that have that pursuit mode with a bell are a waste of time.....it sounds like the local high school just let out.
Overall, I like them. They are very functional, and if installed properly they will outlast the vehicle, if not 2 or 3.
As for old FS, when you put the PA20 "Interceptor" in between WAIL and YELP, it makes that cow sound, but the cooler part is when you drop it back into WAIL - it ramps down, then starts a new cycle mid-stream then does normal WAIL....coolest thing I have ever heard!! I love making the truck that has one do that.
Scary part is, the truck is a 78 Chevy, the lightbar is TwinSonic and the siren is a PA20. It's almost like Squad 51 painted white

Do not make Sig angry...he'll just keep ringing the bell.