Review on 🚗 Upower 4-Inch Inlet Diesel Exhaust Muffler 7x24 Body: Straight Through Stainless Steel Resonator Muffler XS2772 by Paul Hubbard

I bought this for my 2001 F-350 with a 7.3 diesel. I already had a 4" turbo rear exhaust on a straight pipe truck. I tow new RV's with it so about 50% of the time I'm driving cross country it has a trailer attached to it driving the drone at 65mph (where I normally drive when towing, that's about 1900rpm ) drove me crazy. This muffler significantly reduces exhaust hum when towing. I'm giving it 4 stars because the hum is still clearly noticeable but has been reduced to a very acceptable level. Probably deserves 5 stars but maybe I was a bit optimistic about ANY muffler's ability to shut down such a noisy engine. When driving without a trailer, cabin noise is hardly worth mentioning, since road and wind noise are about the same. Outside noise, which I wasn't worried about, is also greatly reduced. If any of you are worried about that, this muffler definitely does the job. The exterior noise is a bit louder than the factory exhaust, but not at all unpleasant. the noise can still be louder than the exhaust. Definitely at idle.