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To celebrate our 40th anniversary, we're offering a dual promotion: $30 off plus free shipping to continental U.S. destinations only on all cat back and complete exhaust systems! Simply use coupon code XHAUST40 during checkout. Free shipping is for exhaust systems only, excluding truck freight items; regular shipping rates apply for additional items on your order; retail orders only; may not be combined with any other offer or discount; offer valid through September 24, 2015