4Pcs 44mm x 66mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box Port Tube Vent H11 X 80mm for BMW 330xi 2005-2006

for BMW 330xi 2005-2006

16"(M4) diameter hole for the screw

just insert and play and no modification needed

CK4Z-17K707-A

Thickness (B): 9/32"

4Pcs 44mm x 66mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box Port Tube Vent H11 X 80mm for BMW 330xi 2005-2006Features: Speaker Port Tube is used to improve the bass response of many types of speakers. There are plenty of types to help you with your vented box design, and carries tubes of every shape and size, including adjustable length ports and flared ports. These port tubes are a reliable, convenient installation, while at the same time providing a finished, "pro" look to your bass reflex speaker building project. Normal tubes suffer from nasty turbulence