Heres the sound of the jake brake on our 65 white freightliner WFT cabover. It has a muffler on it and it sounds pretty good. Were working on getting a 6" straight stack for it. It has backdrop manifolds witch makes it sound good.
freightliner, kenworth, peterbilt, western, star, NHC-250, cummins, naturally, aspirated, jake, brake, loud, cat, detroit, diesel, 5x4, twin, stick, shifting