If you banged the cat, you could have wrecked the inside element. It's pretty fragile. Mazda's right, you should take the cat off and visually verify it's intact. A broken cat restricts exhaust flow, which kills your engine.

 

okay so, while ive got the chance of having my rx8 in downtime i my aswell ask if anyone knows how, what and why is there a rattle coming from the exhaust pipe before connecting to the chamber, it is very noticeable even from ignition, it sounds like a rock or a loose bracket. someone with any helpful advise please help.

 

Going to jump in this thread. I've been reading about my symptoms that my car has been giving off for at least 3 months now. Can't find anything or anyone that has had the same symptoms. When my car get warmed up really good sometimes and especially when I take it on a long stretch without stopping, like the the iterstate. It makes a rattle noise from underneath. Sounds like metal clanking on metal. It does it sometimes at idle and will go away when I rev it up just a little. And when im hitting bumps it pretty much always rattles now.
It started doing this after I got my clutch put in.
It also makes the same exact noise regardless of the conditions when it's raining really really heavy and I hit a big puddle.

 

No performance issues. I'd appreciate some opinions. I always try to do as much research as I can before posting questions.

 

I think someone wants a spanking.

16. Do not deliberately inflate your post count, aka "post-whoring" by responding to a thread with multiple responses when one would do, or "contributing" to threads with a constant string of "me to" or "yeah!" type comments. This has been tolerated in the past but will be no longer. Deliberately inflating one's post count does nothing but waste server space and turn otherwise useful threads into impossible to navigate pages of junk. If you want to chit chat, go to the lounge where useless threads are the norm. :-)

 

hey guys I recently spun out at an intersection and ended up runnning over a traffic island but luckily didn't hit anyone but I did dented my rims , how ever since then I noticed my car sounds more airy and muffled not a clean strong exhaust sound and I've noticed the torque of my car decreased tremendously I've already checked the under neath of my car no punctures only a minor scrape on the brand new cat I recently bought but my car has been acting very sluggish since the incident and sounds more older type of exhaust sound than a clearer sound any thoughts or methods I should use to regain my power and sound maybe

 

sounds like exhaust issue... via mounts for exhaust like if you scraped the bottom of your car