JB4 ISO 5 piggyback tune for the BMW N54 engine. The unit has been upgraded to v32_4 firmware. I had this JB4 installed on my car have used it for 2 years. It has worked well on my 2009 335 while it was installed. I am selling it because I decided to try a different type of tune. This unit has worked on my car, by I can't guarantee how it will work on buyers car. Therefore, I am selling this as is and it is the buyers responsibility to ensure proper installation in their car.