Here is my 130i with 135i PE and Resonator delete. I don't feel there is any drone, just a sporty exhaust, quiet when idling and under 3k rpm, sounds amazing up the top. Get some pops and cracks.
I did a DIY resonator delete. I cut open the resonator and wrapped the perforated holes with header tape wrap and secured it with hose clamps.
https://photos.app.goo.gl/zNa4fP5dLE6uHnxh9
https://photos.app.goo.gl/Cmytauw8sfE6CN7r9
https://photos.app.goo.gl/tZyjfKtPxYougTjF6
https://photos.app.goo.gl/QRCuHoW54AqjCaJHA