Wow those are nice! They add a whole different feel to it. My favorite siren looks evern cooler now. 8) (10V) It seems like it should help focus more sound down now too.
Proud owner of a 1986 Thunderbeam RSH-10B (Blown) and a 1954 Thunderbolt 1000A. (With 4/5) flickr YouTube
They look kind of like exhaust tips.....resonators!!!! =P
Owner/Operator of SirenTex LLC
Proud of a Federal Signal Thunderbolt 1000T, 2t22A, Model 2t, Model 3 Model 5, SD-10, STH-10, American Signal Corp. T-128, Whelen WPS-2750 and too many Whelen Lights
Definitely adds a bit of a "wow" factor to the appearance of the units... now let's hear the difference...
The unofficial ARS resident white noise since 2010 http://www.youtube.com/MKIIProductions
Jacob Green - 25, Wichita, Kansas
You can buy any radio you want, just don't buy a Baofeng and call it a scanner.