I, too tow a boat, 21' open bow, and have never had any exhaust soot in or on the hull of the boat (my ISL370 is pre DPF/DEf). The exhaust tip on my coach is pointed down and out so the exhaust shoots out to the side of the roadway.
__________________
Jake
2005 DSDP 4024, Cummins ISL 370, Spartan MM Chassis / 2018 Ford Taurus, Roadmaster Base Plate, Blue Ox Aventa LX Tow Bar, RVI 2 Brakes
|