X-pipe
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Magnaflow makes a generic Xpipe they retail for 100 bucks or more. Problem with the Xpipe is it makes the exhaust too long for regular pipe bends. You need a mandrel bender to put an S in the pipes for aftermarket tips to work. JDM and Bassani are making cat backs with this design. An X will make it a little smoother tone by combining the two banks of cylinders. It adds no noise that is the muffelr and converters job.