Recently got a Banzai midpipe for my fd3s. I got it used and the seller said he put maybe 20k miles on it, but it sounds like something inside the magna flow is rattling around. I'll attach a link to a video. What do you all think?

https://youtube.com/watch?v=-3QAnVnLaF8&feature=shared

 

You sure its not an exhaust leak? For it to sound like that, you would have noticed before installing it that something was rattling around.

 

Well, that's the thing, I did notice a couple small pebble sized "fragments" moving around inside the resonator when I was inspecting the exhaust. They didn't sound large enough to me to make so much noise.

I think everything is pretty leak free from front to back. Even with my last midpipe I had an exhaust leak where it meets with the downpipe and I didn't have any strange noises.