I have this really annoying rattle sound from under the car. It is driving me nuts. I am embarrassed to drive the bimmer right now. So, yesterday, I got underneath to have a look. I was hoping it would be my exhaust heat shield, and I was gonna just rip the damn thing off. I found that every flange and bolt on my exhaust from the end of the cats to the tips of the muffler are rusted out. Not just a little bit, they are now just nubs, unrecognizable as bolts.
Soo, I'm thinking with 140K on this thing, it's probably time for replacement of everything from the manifold back.
Where is the cheapest place to buy a new cat section? Has anyone tried any of these ebay ones that are only about $300?
Also, I want performance, but I hate loud exhaust. I'm almost positive the UUC will be too loud. What is the quietest cat back system, or should I just remain with stock or maybe M3?
P.S. I didn't find the rattle after all that. Could it be something with the brakes?