Performance Air Intake for BMW Z3 318i 318is 318ti (1996-1999) 1.9L EngineOptimize Airflow for your BMW 1. 9L M44 Powered Z3 and 318 Series Who Its For: Designed specifically for BMW 3 Series and Z3 owners running the 1. 9L M44 engine family. If youre looking to sharpen throttle response and hear that classic BMW four cylinder induction note, this is the proper hardware for your chassis. The Problem: The M44 engine is a high revving, dual overhead cam unit, but its often choked by a factory air box designed more for sound