I modified a Project a Flex two years ago but never put it on a vehicle.
The OEM replacement lists for $!50 just for speaker hose, and that's cost prohibitive.
I mounted the heater/radiator hose for about $12 and the acoustic levels are quiet good. Whelen install manual gives you the original specifications, and I calculated the tube volume so that it would resemble OEM specs.
If you want one, I would be willing to sell the one I have in storage for $85, shipped.
I paid $75 for it, repaired the sound reflector and used a high quality replacement hose.
Send me a PM or email me at
richardland@comcast.net.
Richard
tnems7