Double X pipe on a Mustang: Does it make a noticeable difference?

[iloveanycar]

Has anyone here installed a double X pipe on their Mustang? I’m curious if it actually improves performance or if it’s mainly for sound. I’m considering making the switch but would like to hear some real-world experiences first. Does it give you that deeper exhaust note without too much drone? Also, any noticeable gains in horsepower or torque?