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I had stage 1, and updated to stage 2. No other mods but the stage 2. I would have deffinately noticed prior to install the swoosh sound.. It truly sounds like an after market blow off valve. Umm...I need to keep laptop hooked up while doing runs?? I hope that's not what he means ;( hard to fit a human under my hood while holding my lap top, I didn't pass USB cable through glove box...figured I'd connect it directly to unit when firmware would need upgrades.
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