What mufflers for 340

That unique Flowmaster sound is what makes that company profitable and has made them a household name. The bass notes that are typically lost on a Turbo or straight through muffler with glass packing has given them that signature sound. I can tell a FM muffler blindfolded. The downside of the 40 series is it’s loud and they typically drone like crazy. FM has done a nice job in quieting things down and greatly reducing drone with their 50, 60, and 70 series while keeping that bass, FM sound. People don’t realize that and tend to use the “ dronemaster” description for all FM mufflers. Do they flow like a good turbo or straight- thru? No. But they flow enough for the street, where you spend 99.9% of the time.