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The sound recordings are almost too good so there is so much other noise it's hard to hear and separate "bad" from "normal" noises. I don't think I hear a major DI problem but if there is a minor one you won't hear it recording from the engine bay.
Asking tuners or engineers to specifically tell you that you do or don't have problem with a single piece of data is why they aren't jumping in (plus we all have hundreds of customers and other business that will always take priority). We simply can't make judgement calls without seeing lots of data to back up any theories we may have. If you had a data log and we could see DI pressure waves or even your cam timing plot we could say hey it all looks normal and you're just being paranoid or that you might have a legitimate problem.
Thanks,
Phil Grabow
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