I have had this on my 2012 F30 335i for about 2 years and have loved it. I no longer have the car so it is up for sale. 20 min install time.
BMS Stage 1
"add up to 50 whp and 60 wtq to your completely stock M235, 335, 435, 535, 640 and X BMW. "
This has "harness B" for 2012+ models
https://x-ph.com/bms-jb-stage-1-n55-e-f-chassis/
$190 shipped conus