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Yea, I have made the same observation. It sounds great doing simple driving around town and you can gab it up while doing it. Up to 45 or so it just sounds SWEET! Nice rumble with not being too loud. At 55 on the freeway grades it's still a bit too loud to talk. Slow down a tad or run on...

WOW, lots of activity on mufflers. Without a muffler I found my truck would tickle my eardrums when at freeway speeds on grades, which is WAY too loud. I decided to install the AT3535XL because I wanted a little growl, but wanted it to be bearable without ear plugs. Also hoped to keep a...

welldigger do you have a sound file of your truck? I got the 3535XL (long version) yesterday and plan to mount it soon. Can't wait! Rmtaunton or others, can you share a sound file or make a youtube video of your new muffler sound?

You're welcome peashooer! The only thing I have against the smaller Donaldson is a concern about how restrictive it is. Can anyone speak to the design details of the short Donaldson? Does it have an obstruction inline or is it really a straight-thru perforated tube (is what they publish...

Here's my summary of available mufflers: Manufacturer Part Number Inlet Outlet Body Dia. Body Length Overall Length Price Notes Aero Exhaust Turbine AT3535 3.5 3.5 6 12 20 $ 100 Straight thru design twist baffle, polished stainless Aero Exhaust Turbine AT3535XL 3.5...

Here's my summary of available mufflers: