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I dont have any drone either, but I'm a 3.8L. I also had some vibration at low RPM, but after re-torquing all the bolts it went away. Re-torquing has solved the vibration for many folks, give it a shot.
I just emailed AWE and asked for their feedback as well. Will post here once I hear back.
thanks for the tip!
The switchpath sounds amazing, It is loud when valves are open, exotic, high pitch sound. Exactly how I want it. Quiet when closed, best of both worlds indeed.