Thanks for the replies.. I have a single flomaster 40series.. and It's rumble (humming noise) inside at certain rpm's will hurt your ears... anyway so far I think I am going try to take off the large tip to help the inside vibration humming.. sounds like an easy sensible solution..
But tonight other problems... the AC fan stopped!!!!! (fuse is fine) Darn.... not good especially when the windows don't work good anyway!!!!!
Ed