I have a stock 3 inch no muffler or cat though, you can see the rest of my setup on my sig. Now my exhaust seems to get louder and louder as time passes. I cannot find any leaks and it sounds like a kind of high pitch rattling noise, if an HX-35 is kicking the bucket will I hear a dry bearing or something through the exhaust? I have been running it at 42 lbs WOT for 2 years now. I know its horrible to do and I am upgrading soon ( HTB2 62/14 ). But could this be what I am hearing?? Any advice please the noise is driving me batty.

 

When a turbo goes you'll hear it during boost most of all. It makes a HORRIBLE sound, and you'll know it.

 

I meant to say that I dont notice it at idle at all. What else could it be do ya think?? It quiets down at full boost.