Having done my 335xi I would highly recommend yo use model 11236 which is a 14" 4X9 Oval muffler with 2.5" internal pipe , I have had it for almost 2 years and the sound is amazing with no drone
I am currently shopping for a 35i or 35is and plan to do the same thing , the only thing I'm debating is if I will use an 11" muffler instead model 11366 which would be louder
I chose satin stainless but both models are available polished
Video( not the best but gives an idea)
