Review on π Flowmaster 853548 Super 40 Series Muffler: Efficient Performance and Enhanced Sound Control by Andrew Davenport
Nice but too loud for me.
My 2021 Silverado HD 6.6L was equipped with Super 40. Sounds great at idle, but there's a lot of cabin rumble at times. So be careful, if you like a quiet cabin this is NOT for you. It softens around 70 mph, but between 35 and 50 mph it can make a lot of noise in the cabin. To edit. I ended up replacing it with an HD 50 series and it has enough noise cancellation to be able to talk in the booth. If you have a heavy truck I would choose the 50 Series HD over the Super 40.
- Excellent overall performance
- Not everything fits
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