I know the favorite aftermarket muffler here seems to be the Aero 4040 xl, but I came across this in a recent diesel magazine and was wondering if anybody has any experience with them. Good? bad? Mileage difference? cabin noise????

Thanks

Website says they are a division of Flowmaster - http://www.hushpower.com/

 

haven't used one but, have meet to people behind Hushpower and you could buy a better backed exhaust IMO. The word is they're great exhausts that are quite without drone.