57S-4521 K&N Cold Air Intake Kit, 2012 - 2020 Holden Colorado/ TrailBlazer 2.8L L4 dw300 The shaft diameter is smaller

The shaft diameter is smaller than the OEM plastic barbell to minimize flow restriction

The outer surface is knurled for easy installation and removal by hand

VCM Heartbeat MAFless OTR

while running too lean (very high air/fuel ratio

Includes fitting kit

57S-4521 K&N Cold Air Intake Kit, 2012 - 2020 Holden Colorado/ TrailBlazer 2.8L L4 dw300 The shaft diameter is smallerOVERVIEW The K&N Performance Airbox is designed to dramatically reduce air flow restriction as well as smooth and straighten air flow. Replacing the restrictive factory air filter and air box allows your engine to inhale more air than with the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. A fully enclosed injection molded air box connects to the factory air intake hose. The removable