I have recently performed a series of exhaust testing using high tech NVH equipment. The resonance is on a lot of vehicles in that rpm range. We fixed the problem on one group of vehicles by installing a Bullet type muffler (like a Walker) in front of the typical muffler. Immediate success and no loss in performance.
I plan on doing the same deal to my street car if the VOE mufflers have any drone in that rpm range. If works, guys.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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