Cleaning BMW N47 Air Intake Manifold Intake Valve Channel Walnut Blast Part1 (2022 Version)

i did the cleaning work for air intake manifold about 3 years ago, this time i prepared littel more equipment and invest more time for the cleaning work and used walnut blasting the intake valve channel. now it is good for next 60000 -100000 km.

[@GTX3570]

How do you clean the valve holes?

[@threestones9782]

pls take a look on part 2