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Message: [QUOTE="Jason, post: 143950, member: 430"] I run 4" MBRP with the muffler, and mine whistles like a early '03 6.0 at parking lot cruising speed, or going through a neighborhood, but goes to a big block rumble under load. There's 2 ways to run a MBRP muffler, one way is louder than the other. I think if the baffles face forward, letting the air run through the little grooves and through the packing it's quieter..mines ran the opposite way, more straight through, but alot more "toned". Kinda like a 6.0 with exhaust. I'd like to get rid of some of the drone in the cab when towing..if you pull a trailer that has a front wall (enclosed, or gooseneck) it resonates off the frontal area, and is annoying as piss inside. OP- so with the resonator installed, it's quieter through the exhaust on the outside? [/QUOTE]

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