Originally Posted by 4doorfury

I have this weird intermittent rattle like sound around 3-5k rpm. Trying to figure out if the cats are my issue

Originally Posted by crazjayz

I started getting the cat rattle 2-3 months ago in my driver's side cat. Mine can distinctly be heard from the inside of the car sitting in my garage between 950-1150 rpm. Holding the throttle to 1k pretty much sets it off. From what I'm guessing I probably have a few months before the completely collapse.

I was quoted $860 from my mechanic and +$1k from the dealership to get it fixed. I'm thinking of getting RHFC, but I live in CA and don't think they'll visually pass smog. I might get them and just weld the cat cover to the bottom of them to make them look stock.

For those asking, it sounds like lose nut bouncing around. Previously it was louder inside the car, but now you can definitely hear it outside. Here's a video of it happening for a few seconds. Note: you'll have to turn up your volume probably to max to hear it.
Cat Rattle