[keiridin]

I have a full Active Autowerke Signature Series system that includes, DP's, Single Mid, and Muffler. The drone is unbearable in efficient mode especially when going low speeds at low RPM's. Just doing 40 MPH at 2K RPM is awful. Plus there is a ton of vibration that I think is also coming from drone? The sound and drone in sport doesn’t bother.

I'm ready to replace any/all of the parts to get rid of the drone but not sure which one. I'm hearing mixed answers, some say it's the DP while others say it's the muffler causing the drone. What can I do to eliminate the drone in efficient mode?

Question - what causes drone?