Used Index 5 fuel injector for N54. Purchased on Ebay and vendor sent wrong index. He said it came from a running car. His other injectors worked. I removed the teflon seal with the special tool. This injector will need a new teflon seal part 13 53 7 584 315 and decoupler part 13 53 7 564 751. A special bushing tool needs to compress the seal prior to installation and fuel injector will need to be calibrated. This whole process is simple. Free to a BMW CCA member in need.
N54 Index 5 Fuel Injector