The Diesel Tees 2013 Black Friday Sale is 13% Off everything and a free gift with orders over $35 when using discount code “HOLIDAY13″. This applies to all Diesel Tees products along with Cummins, Power Stroke, Duramax, Peterbilt, Kenworth, Caterpillar, Freightliner and all other products at www.DieselTees.com