Hi,
I figured I would post this here since there isn't much activity on the A5 forum and we share the same engine.
I installed my Spulen 3" DP and Hi Flow Cat recently and am wondering if this is normal. I Seafoamed by 2011 A5 using the technique here posted and I noticed I was pouring some white smoke out of my front o2 sensor. The front o2 sensor is on super tight, so I have no idea how it could be leaking.
Also to add to it I am getting a slight buzzing noise from my HFC/downpipe area when I gas it at a low rpm 1800-2400rpm once in a while depending on how I gas it, almost like a bee. I figured it was just extra turbo noise with the less restrictive HFC. I am not sure if the issues are related or not.
I don't notice any kind of power loss at all, FYI.
Any ideas?
Thanks in advance
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