Review on 🔊 MagnaFlow Oval Center/Offset Performance Muffler Exhaust 5x8 Straight-Through Satin Finish - Model 12229 by Daniel Mind

Vehicle: 2001 GMC Sierra 4.8L V8. Rear gear ratio 3.73. I recently had a 40's Flowmaster Bought stock for my Sierra and couldn't stand the highway rumble on the interstate.Took it out and took it back to the factory.Decided to test the aftermarket muffler again but this time Magnaflow as they use different technology than the Flowmaster. I drove another 4.8 liter Silverado with the #12259 (18") muffler and while there was no hum, it was very quiet and not much louder than stock. I chose this model 12229 (14") because it is a bit louder than the 18" model. One blunder, the freeway roar is still not as bad as the Flowmaster form as far as I can remember, but still bad enough. On the plus side, it sounds awful around town, especially between 2000-3000 rpm. I ended up putting the stock muffler back on (again) and selling it on Craigslist for about $50. Lesson learned: either get a real exhaust system or don't mess with the exhaust at all. It's not worth trying to go the cheap route and just wiggle the muffler.