I talked to some one at hornblasters I think, maby somewhere else but they do sugest you not run them upside down. But with them being exposed to air under my truck instead of say in my bed, and I dont run them that much, the person I spoke with said they dough I have a problem. I am kinda taking a chance with it but as little as I run them I think I will be ok. If not I will build a hanger and hang them up right.
I really like them. I have had some good laughs with them, plus everybody knows I am coming now! Had a lady try to cut me out of a parking spot on my side of the lot, so I started pulling in and she honked her honda's lil horn at me....... She had her window down and was calling me names....... I hit the horn, she quit calling me names and left the walmart. Everybody that saw it thought it was funny! J.Wal