I just re-carpeted the engine cover as well as the whole motorhome. I used high density foam padding on the engine cover, not the******that comes from the factory, but it is still quite loud. I do not believe that my engine cover has a sound deadening blanket inside of it. I may look into that and if I have to I can glue it to the cover. I always hear about sound deadening or sound proofing spray on liners. Anyone have any luck with any of these? I like turning down the hearing aids. I probably will be needing them soon :)