So I contacted Burger Motorsports and this is the response that they gave me.
"Hi,
Thank you for reaching out to us for your tuning needs.
We have 2 tuners that will be compatible for you car.
We have the JB+, which will give you a quick 3psi with no hassle installation and you do not have to worry about settings.
http://www.burgertuning.com/B48_B58_...all_tuner.html
We also have the JB4, which can give you power gains up to 40whp (55hp crack) on a completely stock car on pump gas.
http://www.burgertuning.com/B58_JB4_...nce_tuner.html
The JB4 Features a plug and play installation and have features like in dash map switching between factory and various performance maps, optional in dash gauge displays for boost, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built in data logging, built in code reading, optional direct EWG control to prevent throttle closure with exhaust modifications, exhaust flapper control, and much more.
I would also strongly recommend you pair the JB4 with either the Data Cable or Bluetooth Kit to fully access all of JB4's features like data logging and reading/deleting fault codes to updating to the latest firmware.
http://www.burgertuning.com/USB_Cable_Extension.html
http://www.burgertuning.com/bluetoot...nnect_kit.html
A lot of G20 330i owners have given us feed back the JB4 has a smoother delivery of power and performance so giving you the information on that as well.
Let me know if there is anything else I can assist you with.
Regards,
Burger Motorsports, Inc."