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  1. Engine and Technical Discussion
    Hi after changing my lower o2 sensors which I'm pretty sure they were called downstream? Are the upper ones just called upstream? Do I have to stick with oem if I have my car tuned and also does anyone have a picture or diagram of how to get at these and where they are located? Thanks for the help!
  2. 3.0t
    Is it difficult to change the O2 sensors? Is there a good thread on here that I could not find on the search bar? I need to change the ones in my megans downpipes, just need to know if I have to watch out for anything or do things a certain way and another thing, parts for cars are low right now...
  3. Q50 General Discussion Forum
    So this past weekend 5-7 I finally had time to install my AMS LDP. Of course everything was going relatively smooth. Loosened all the nuts to the stock lower downpipes. Got the passenger one out first, had to cut my arms up a bit getting to the passenger O2 sensor connection (What a bitch lol)...
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