Just got it installed with Berk Hi-Flow cats. Wow! HUGE difference. It's also louder than I was expecting due to all of the comments on the exhaust in my research. Most people say it's quiet for an aftermarket exhaust. Wtf?
Thing is fairly loud. Might be the HFCs though. Not sure since I put them on at the same time. Will post my iPhone sound vids I took after I record the Ark. So much happier now though. Car sounds gooooood.