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Super old update necro. Resolved this issue 2+ yrs ago just forgot about this thread, figured I’d update for others. Header was rubbing the underpanel and at exactly that RPM the frequency made the weird noise similar to an exhaust leak sound. At the time I checked clearance and it had almost 1” of space but under load the engine rocks and takes up that inch. After a month or so header and skid plate had marks indicating where it was rubbing. Hammered underpanel down and noise/issue 100% gone simple fix.
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