After heavy research and taking a chance I found a dinan exhaust for the 135i that attaches after the axle (VERY important). I found my dinan 135i exhaust from someone parting out his built 135i on Facebook marketplace for a very good price.
I had my exhaust guy slip on my exhaust, he finished in under an hour. He said the fit was perfect for the exhaust hangers but he had to adjust them mildly as the tips are huge compared to stock. But I’ve had no rubbing and no rattling. It really sounds great.
My setup is VRSF catted downpipe with MHD stage 1, and dinan back box. Stock midpipe
The BEST burble tune, in my opinion, for this set up is, medium with 0.8 duration and it only triggers at 2600 rpm when coming off of hard throttle. During normal driving in Drive mode, it sounds very tame, near OEM. Also I get NO burbles in normal drive mode.
Interior
https://youtu.be/4tz9OdmiPRY
https://youtu.be/4Cm6C05ULlI
Drive by in parking garage
https://youtube.com/shorts/GREqkfLRTao?feature=share
Exterior
https://youtu.be/0v6v0rtFgOY