didn't notice anything until a little while ago noisewise, thats when i started poking around at the exhaust cause it started sounding a little flat late. when it warms up it sounded nice and smooth. not sure about the o2 housing, will have to take another look next time i get to the car. obviously i barely drive it these days.
guess since im here...are the downpipes vr4 specific, or will 1g or 2gs work as well? have never had to buy exhaust pieces for these.