BBK Performance Parts - 1994-1995 Ford Mustang - 5.0L - Mid X Pipe With Converters BBK Performance mid X pipes are specifically designed to be used with BBK full length headers to complete installation to cat back exhaust system. 1986-2004 BBK direct replacement X-pipes feature 2.5” diameter CNC mandrel bent aluminized tubing and BBK's unique die stamped performance Xtracter center X section to ensure maximum flow and horsepower. 2005-2009 X-pipes are made from 2-3/4" Tubing and feature a merged X to maximize the potential of Ford's 4.6L 3-V engine. Each BBK mid X pipe offers performance, quality and value that guarantees years of top performance for your Ford Mustang.