WBA Walnut Blast Adapter – BMW N47 / N57 Intake Port Carbon Cleaning Tool | High-Strength Vacuum Adapter. ????For BMW 2.0 & 3.0 Diesel Engines – N47 (4-Cyl) & N57 (6-Cyl). Tackle intake carbon build-up the right way with theWBA Walnut Blast Adapter, designed for clean, efficient walnut shell blasting on BMW N47 and N57 diesel engines.
