2003 2500HD 6.0 GMC Sierra
I like the sound and tone from the Dynomax Ultra flow X. I still need to finish running exhaust over the axle to get the sound out from under the bed. Currently there is a heavy drone sound around 2k to 2.5k RPM. So at 60- 70-ish it is resonating inside the cab. Once I get the tail pipes completed it won't be doing that.
Liking the sound and tone way better than what I had before which was the teeny-tiny Flowmaster Flow FX mufflers...and I was unaware there are two styles of the Flow FX mufflers.