Homemade mod with factory exhaust by "dalecan" method, with bigger from Subaru WRX tips
Very happy with this modification, she sounds absolutely normal until you ask for.
All credits goes to Mr. Dalecan -
https://z4-forum.com/forum/viewtopic...89874c50008cb5
Link for video and sound
https://vgy.me/u/b61oZA