Armo how did you file down he 02 sensor?
Does the rattle starts at 6k RPM's? I have the same issue, I've checked for air leaks, checked for loose bolts, checked the gaskets and everything's seems fine. From what I hear is that the rattle sound is more like the intake and downpipe sucking more air in.Thanks Armo. Also for the Q300 install did you notice any rattle Armo. Cause i just installed mine yesterday & it rattles. I see its hitting against a metal part under the car. What can it be?
Awesome DIY, wish I would have read it when I did mine. The cowl was the most frustrating part for me. Did at my friends shop on of his racks ( very lucky to be friends with a guy that owns a shop and rack ). Of course way easier than on your back on with jackstands. I also had a rattle problem in my N1 after install. Went ahead and pushed in some of the heat shields, and then noticed the muffler has a little bracket that connects the hanger rods together for support. That little bracket rod was hitting the cars hangar and you could see where there was paint missing. So I cut the bracket and boom no more rattle. Sounds great.