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BBK 3 inch Off-Road X-Pipe for Mustang GT is specifically designed to be used with BBK full length headers to complete the installation to the cat back exhaust system. 1986-2004 BBK X-pipes feature 2.5 inch diameter CNC mandrel bent aluminized tubing and BBK's unique die stamped performance. The Xtracter center X section ensures maximum flow and horsepower. The 2005-2012 X-pipes are made from 2-3/4 inch tubing and features a merged X to maximize the potential of Ford's latest high performance engines. Each BBK X pipe offers performance, quality and value that guarantees years of top performance for the Ford Mustang.