Installation of the COBB Tuning Downpipe
*Note: The COBB Downpipe replaces both of the catalytic converter sections after the turbo with a one piece unit.
1) Install the factory O2 sensor in the rear bung of the COBB Downpipe. Use a little anti-seize on the threads, but do not get any on the probe of the sensor.
2) Make sure that the bung plug on the cast section of the downpipe is in place and tight. It uses a 10mm Allen-head tool and should be torqued to at least 25 ft-lbs of torque.
3) Remove the rear doughnut gasket form the factory downpipe and install it in the same position on the COBB Downpipe. A picture is below for identification purposes. Note: Some aftermarket
cat-backs do not use the factory style doughnut gasket . You will use the gasket that should have been provided with that system. Our cat-back retains use of the stock doughnut gasket.
4) Place the downpipe into position. It is easiest to slide the cast portion onto the studs first and swing the rear into position, then let the downpipe bracket click into the bracket hanging down
from the transmission. You may have to swing the cat-back toward the rear of the car so that the downpipe can swing into position. The downpipe should stay in place while you install the
hardware because of the brackets and studs on the turbo.
5) Reinstall the bolt that holds the downpipe to the bracket hanging down from the transmission. Leave itloose so that you can install the rest of the hardwareReinstall the bolt that holds the
downpipe to the bracket hanging down from the transmission. Leave it loose so that you can install the rest of the hardware.
6) Reinstall the spring-loaded hardware that holds the downpipe to the cat-back. The bolts and springs go on the cat-back side and the nuts toward the downpipe. Tighten the nuts to
approximately 12-13 ft-lbs.
7) Reinstall the hardware that holds the downpipe to the turbo. Use some anti-seize lubricant on the threads if possible. If you plan on reinstalling the heatshield, make sure to place the
heatshield bracket into position. It goes on the back of the cast flange on the COBB Downpipe with the “angled down”part of the bracket toward the center of the car. Torque the
hardware holding the downpipe to the turbo to approximately 26 ft-lbs.
8) Torque the hardware holding the downpipe bracket to the bracket hanging down from the transmission to approximately 26 ft-lbs of torque.
9) Reconnect the Oxygen Sensor. With the new position you'll need to forgo use of the stock wiring harness clips on the underside of the car and use a zip-tie to keep it up and out of the way of any heat sources and moving parts before plugging it in to the connector.
10) Reinstall the heatshield if you are doing so. Torque the bolts to approximately 12 ft-lbs. Trimming examples are below.
11) Reinstall the intercooler in reverse order of removal. Make sure the clamps are tight so there are no air leaks.
12) Enjoy your new COBB Tuning Downpipe!