Coolant Expansion TankClean up your engine bay or replaced your cracked unit with a new coolant expansion tank. OE Part # 171 121 407 F 171121407 F 171 121 407 F 171121407F

NOTE: Hood pins are REQUIRED

resulting in increased power output and a great sporty sound that is civilized when you want it to be and pleasantly aggressive under harder acceleration with zero drone

a sealing V-Band fastener system

Revo software really allows the car to utilize this increase in airflow

Uses high-flow 200 Cell HJS Sport Catalytic converters for improved exhaust flow and sound

5Q0-521-127 / 5Q0 521 127 / 5Q0521127

The greater the density of the charge mix in the cylinder the more power generated on combustion

Can Be Used On Street/Race Track

FITS Mk4 Golf/Jetta Thru 10/00

Installing the IE 3" catted downpipe on your B9 A4

It needed to deliver an exhilarating wail at full throttle yet be quiet and civil during part throttle

Installation Instructions: Dinan F06/F1X M6 High Flow Carbon Intake D760-0037 Installation