If your BMW has tuning high boost, double side aluminum pipe.... make your BMW even better
Replaces BMW part number:
13717605044
13717597591
KEY FEATURES
OEM Fitment
Increase Caliber and Flow
Increase Throttle Response
Decrease Turbo Lag
3-Ply Reinforced Silicone Couplers
Bung for Water Injection
Smooth Electroplating Inside (optional, customized color) 
APPLICATIONS
M125i
220i
320i ,328i   320GT  328GT 
420i ,428i , 420GC , 428GC