Miata Exhaust Rattling

[snokedogg911]

I got a aftermarket cat back, and it didn't make any noise at all for about a month. Now it's rattling on the back bumper where it comes out. It keeps moving around on the rubber hangers and you can move it back to wear it should be and the noise will go away until it gets bumped back to were it was. Any ideas for a fix?

 

[WillD]

Where is the rattling sound coming from specifically? Has the cat ever been replaced?

You say the sound goes away when you adjust the exhaust in the hangers? I've had my Enthuza exhaust on for a couple thousand miles and it has never rattled or moved in the hangers one time.

 

[snokedogg911]

Right were the muffler tip comes out, the side of the muffler tip is rattling up against the side of the bumper were it comes out specifically when you shift and the rpms go down then it goes away as they rise again. And yes the cat back was replaced about 7 months ago, and i had a muffler shop put this on for me and it was fine for about a month now i'm getting this rattling.

 

[chiefmg]

You can either try some stiffer hangers (usually made from urethane) or get a hose clamp big enough to fit around the outside of the stock rubber hanger and tighten it on there to provide some stiffness.