Bet something needs clearanced, never seen the Pro Series not satisfy. Double check motor and trans mounts as wellI just installed the Hushpower II 19101 on my '05 and I am very unhappy with the drone. The truck sounds good outside but at 2100-2300 RPM it vibrates the rearview mirror and you cant hardly talk in the cab. I guess that would be ok if that wasn't the speed that I drive at the most. I am going to try the Donaldson and see if it is better.