OutlawDrifter
Long Roof K2500 Driver
The Thrush 2 chamber (flowmaster 40 knockoffs) I ran droned for maybe the first 400-500 miles, and then completely stopped, leaving only the trademark/signature blub-blub-blub-blub-blub sound that 2 chamber mufflers are known for. They do a very nice job of cancelling out raspy high pitched frequencies. They sounded good, just didn't live very long. Mine were duals with corner exits at the bumper.
good to know, i like the flowmaster sound. i just don't care for it in the cab! i've been very happy with my ultraflows on the last couple of pickups, they have a sound all their own, you get the deep sound of a big glasspack without the pop and crackle.