Panels. Drone still exists. I have a full 3" exhaust from SZ. Today I plan to install Vibrant 1794 resonators in the test pipes prior to the X- pipe. From your set up description this might not help much. Jonathan at SZ recommend high flow cats. Some members have tried the side branch resonators but reported it doesn't cure the drone depending on the frequency. Good luck and keep us posted. I will post my results as well