BBK Performance Parts - 2005-2010 Mustang GT - Off Road Mid X Pipe - 2-3/4" BBK Performance mid X pipes are specifically designed to be used with BBK full length headers to complete the installation to the cat back exhaust system. 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. Note; Off-Road versions are not EPA street legal! Each BBK mid X pipe offers performance, quality and value that guarantees years of top performance for your Ford Mustang. Please note: *ALL – OFF ROAD pipes do not have any catalytic converters and are manufactured and represented ONLY for the purpose of OFF ROAD-RACE USE ONLY. *These High Performance pipes are NOT EPA Street Legal in any state.