RV6 Catless FP/DP Drone when engine braking

[Phylanx]

Just installed my RV6 Catless DP / FP over the weekend. The DP/ FP quality is outstanding and fitment is tight in some places, but nothing is rubbing, and I don't have any rattles.

What I do have is a pronounced droning / cabin vibration when I engine brake above 4k rpm or 5k rpm. Seems to last for a second or two and then is muted.

Stock Exhaust currently. I've been double checking all my connections, FP to rest of the exhaust, FP/DP V Band Clamp, Turbo to DP. Everything seems to be buttoned down well.

Does anyone else with this combo have this issue?

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[360glitch]

If anything this is just a characteristic of a catless exhaust with the Si catback. I found that a catless downpipe on my Sport hatch was much more forgiving when it came to resonation, etc. My point is, it's nothing to do with the RV6 design. I have a different downpipe with the factory front pipe and ended up adding another resonator behind it on my Si.