Well, over the weekend I got rid of the 2-chambered 40-series Flowmaster and replaced it with one of the longer 18” bodied Magnaflows with 3” in/out. Instead of just dumping it under the bed in front of the rear axle, I ran it out the side in front of the rear tire. It’s definitely quieter than the Flowmaster was when there is no load, or a light load on the motor…much quieter. When just driving the truck around town, it’s definitely quieter.
But, I pulled the boat over the weekend, and when you are hard on the gas and the RPM’s are up over 3000 or so, I’d say it’s just as loud as the Flomaster was as far as overall volume, but the “tone” is smoother and deeper, and not as raspy sounding. It’s still too loud for my taste, the lower deeper tone of the Magnaflow actually bothers me more than the thin raspy sound of the Flowmaster. The one thing that I did notice was that with the Magnaflow, on straight and flat sections of highway running at 65mph….according to the MPG display on the truck, the Magnaflow muffler picked up 1-2MPG vs. the Flowmaster. I guess that just goes to show how restrictive that Flowmaster really was.
I’ve ordered some more 3” pipe sections, so my next step is to run the exhaust all the way out the back dumping behind the rear passenger tire….just like a standard oem truck exhaust. I’m hoping this will do the trick. I kind of like doing exhaust work, it gives me a chance to break out my mig welder and run some wire through it.
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