4Pcs 76mm x 89mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box Port Tube Vent H4 for Chevrolet Silverado 3500 HD

for Chevrolet Silverado 3500 HD 2015-2019

* Total Length: 56mm / 2

for VW Transporter syncro (1993 - 2004)

without HID

4Pcs 76mm x 89mm Speaker Port Tube Subwoofer Bass Reflex Tube Bass Woofer Box Port Tube Vent H4 for Chevrolet Silverado 3500 HDFeatures: 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