BMW e36 m44 IASC intake Boot Secondary Throttle to Main 3-series air duct hose Intake Boot Secondary Throttle Housing to Throttle Housing NOTE: Only for cars with ACS+T. Brand NEW part with full 1 year warranty. BMW part# 13 71 1 433 978, fits m44 engine with ASC+T only. Genuine BMW part, recently made: not been lying around.