Don't go flow master. They sound like crap.
Straight 6s deserve a straight through muffler. A magnaflow will sound nice, be quiet at idle and have a nice tone at open throttle. You can buy them in stainless too. Dynomax ultra flows flow even better and are a at quieter.
"Thrush" and turbo style mufflers might sound like they are made for power, but they are not. They are a classic perforated design that will be very close to a stock replacement in the way of power and sound.
Straight 6s deserve a straight through muffler. A magnaflow will sound nice, be quiet at idle and have a nice tone at open throttle. You can buy them in stainless too. Dynomax ultra flows flow even better and are a at quieter.
"Thrush" and turbo style mufflers might sound like they are made for power, but they are not. They are a classic perforated design that will be very close to a stock replacement in the way of power and sound.