D&D’s 623Z-21X X Cat 2:2 True Exhaust is made specifically for Harley-Davidson Touring (2009-2016)
2:2 True X Header system Only, Mufflers and End Caps NOT Included.
Mega Cat has a straight cut muffler and does not come with end cap. Interchangeable End Caps Sold Separately
The X Cat is a True X header and is a stepped header. Steps are starting at the head 1 5/8″ to 1 3/4″ to 1 7/8″ to 1 3/4″ where the muffler goes to the header.
D&D exhaust systems are designed and dyno tested in our facility. We use the Harley Race Tuner in all our testing. Our systems are designed to increase low-end torque and horsepower. Performance increases on the X-CAT with our Slip-on Mufflers is about 8 to 10 percent depends on the tune on the bike.

















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