On Sunday 4/6, I saw/heard the following truck on I81 South at milepost 199 in Pennsylvania. '03 QC 3500, silver, towing a big 5er horse trailer. The reason I'm asking is it sounded outrageous! Louder, but better, than all the class 8s pulling the same grade. I'd love to know what was done to the exhaust, because it sure wasn't stock! I might need to start bombing mine after all.