Here's my 135i exhaust paired with a resonator delete 2 weeks in.
Has settled quite nicely, was a bit too loud for the first couple of days.
(Taken with iPhone 5 lol)
Just a short clip since I didn't wanna piss off my neighbors, but you get the idea
p.s. Don't mind my f**ked up diffuser.
Here's what it sounded like before the resonator delete, just the 135i muffler (also the day I got it installed)
Much deeper, louder and raspier with the resonator gone. But I like it, personally. Barely any drone whatsoever, the slightest bit at 2.5k rpm, but I aint an old man, doesn't bother me. Crackles and pops A LOT when I ease off the throttle in 1st, 2nd and 3rd.