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I have been following this thread closely because I had plans to order the OFT. Now that I received and installed the stage 1 tune (my car meets the stage 1 requirements), I was able to experience the issue the OP describes. I called Vishnu Performance to listen to their thoughts regarding the odd sounding noise after installing their tune, but the person I spoke to was not aware if the issue. Since many cars have been running this tune for a long time without any consequences, I decided to keep running the tune. After 200 miles on the tune I noticed that the noise has subsided significantly. I don't have the time to test the hypothesis that the noise is subsided after allowing the ECU to learn, but perhaps this will help somebody else.
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