UPDATE: Just install the Type S ADS, part number:
39381-31M-A03
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ITS ADS is perfect imo, had it out on a VERY bumpy karting track last week and it was perfectly controlled in every suspension mode. My favorite thing about it is that it seems to be more of a passive damper setting...
I've been wanting to try this for a while and finally got around to it.
UPDATE: Here's the easiest way to lock the exhaust valve in the open position:
While the car is off the valve is closed.
1. Pull the Active Exhaust Valve fuse, then turn the ignition on, ignition off.
2. Replace the fuse...