[perry8912]

Originally Posted by DuSh

BOS-0221504470 Bosch coil that is a same design for almost every BMW currently in production from 1 series to M6 and X6M and even Alpina.

OEM designation part# is 12138647689 (also Bosch). I believe these are same coils, but designated differently.

https://www.pelicanparts.com/More_In...-8-647-689-M14

https://www.fcpeuro.com/products/bmw...-12131712219x8

https://www.amazon.com/Bosch-0221504.../dp/B004AG9ILM

Okay, Thanks for all these info. I'm not a handy man, so I probably will do all the maintenance work at dealer or indy shop.

Now, let me get this straight. After tune, I should change plugs and coils together every 30k miles or just plugs itself? Will it be okay if I just run stock plugs instead of 1 step colder? Other maintenance like oil change 5-8k miles, transmission, transfer case, and differential oil change every 60k miles. Fuel filter and coolant should be life time? And injectors, hpfp and waste-gate wont be an issue after the tune, right?

I'm a newbie with car modding, so please bear with me with dumb questions.