COBB SF Intake System - WRX MY15-21 CTS Because the factory airbox on

Because the factory airbox on these models now incorporates a hydrocarbon trap (an emissions device)

STI MY257 MY06-07/MY12-21

and other rubber components

It is constructed of fiber reinforced compressed graphite and is intended to allow some relative movement

COBB SF Intake System - WRX MY15-21 CTS Because the factory airbox onSF INTAKE COBB's SF intake removes the restriction of the standard airbox and panel filter by replacing it with a high flow cloth conical filter. A composite plastic velocity stack MAF sensor housing reduces turbulence and a flow straightener ensures more accurate MAF readings. The included powder coated aluminum airbox ensures the intake system is pulling the coldest possible air for maximum air density and performance. Wire reinforced silicone