I recently upgraded the exhaust system on my 2015 Ford Mustang Ecoboost to a 3" all the way back to a 3" inlet with 2, 2.5" outlets to support the dual exhaust system. I already had an axle back system from another company with 2.5" piping as well. The results were LOTS of cabin drone at certain RPM's, and way too loud for street use. I love the axle back system, so I went on the website for the axle back manufacturer I purchased from to find a 3" inlet/outlet resonator to install upstream. Wow, am I glad AWE linked me directly to UroTuning.com! The resonator they recommended was spot on what I was hoping for! It removed most of the drone, and toned down the volume and high RPM rasp just enough to make my car liveable as a daily driver, but still sound mean the way it should! Thanks UroTuning and afe for a great product, built to a high quality standard!