I just ha a ProBox installed and I must say this think rocks. It is only an 8" sub in a ported box but you would never believe it. I was so surprised to hear it. It really hits. I have a Fosgate T1000-1bd pushing it which is way too much amp so I have it turned way down. I already had the amp so I figured I might as well use it. Anyways, the box fits very nice and my amp is under the rear driver side seat. This sounds like two 10's at the least and is very clean. I just thought I'd share in case anyone was wondering about the probox.