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Check your header to skid plate clearance especially on the right side. It could be rattling and or getting close enough to reverberate off of the skid plate under load. Typically sounds like a metallic exhaust leak between 2500-3500rpm under load. The engine rocks to the right and the header will move at least an inch down closer to skid plate. So it might look like it has plenty of clearance when it really doesn’t. Mine made a weird noise between that rpm. Used a rubber mallet put the skid plate on a barbell plate, and hammered it into the hole to “bubble” it down giving another inch of clearance. Fixed my noise. Worth looking into at least.
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