Once I get over 2k rpm I get a real "tinny" rattle noise, almost like a few pennies bouncing around in a coffee can. I checked the heat shield, put some screws in it, and bent back anything that could be making contact with the exhaust. The downpipe was replaced a year ago with a ZZP one, and there don't appear to be any holes in the resonator and the straight pipe that leads to the rear of the car (muffler is removed). The sound almost sounds like its coming from underneath the radio but its hard to know exactly because I can only get the rattling sound when I am driving. Anyone have any suggestions? Im thinking of just replacing everything after the downpipe but would hate to replace all that and still have issues. Any help appreciated!

 

Resonators can come apart on the inside and not be visible

 

Wouldn't I be able to hear **** clanking around if I took the resonator out and shook it? If it was the resonator that was bad.

 

bump. I am about to go under there again, any input appreciated.

 

Yea you should be able to hear it rattling. Check all your exhaust hangers and make sure its not touching the body anywhere

 

I heard putting hose clamps around the rubber exhaust hangers helps with this.

 

I had issue with Hahn exhaust, A set of hangers were touching so I put rubber between them. Issue solved

 

Turns out the bolts that connect the downpipe to the resonator had come a little loose, just enough to cause vibration. Fixed for now, although I wouldn't be surprised if the same issue comes back in 10-15k miles... Thanks anyways guys, that had been bugging me for a while now.