Super 50 is a great compromise that gives you power and performance without the noise in the truck, around the neighborhood or in the wild. I'm an Oilfield Safety Specialist and I work tirelessly, over 100 hours a week. My truck runs day and night and the 40 series was just the loader I liked. I tow trailers almost every day and there was too much in the truck. Pulling out my 33 foot van made the noise louder in my 2006 Dodge Ram 1500 with a 5.7 Hemi coming out the rear bumper with twin 21/2 tailpipes. I'm 54 and I still enjoy listening to my truck, but I love sitting in it and writing reports and talking on the phone without the cab noise. Many Thanks.