How to Turn Up Boost on a 1.8T

1. Remove the stock turbo-to-intercooler pressure tube by loosening the clamps that secure it to the silicone rubber connector on top of the engine. Slide the tube out of the connector and lay it off to one side so that you have easier access to the stock N75.
2. Identify the N75. The valve has a three-way fitting on the bottom, which has a 90-degree rubber elbow and corrugated vacuum line connected to one side and an angled, molded-rubber line secured with a hose clamp on the other. The corrugated line is clamped to the plastic intake tube just before the flex portion. Turn the N75 to expose the round top and the wiring harness attached there. Unplug the harness.
3. Grasp and remove the hose clamp on the bottom of the N75 where the short section of tube connects to the intake. Pull on the valve to release it. Cut the non-reusable hose clamps off the other two rubber lines using either a pair of wire cutters or a hobby-style rotary tool. Be careful not to nick the hoses.
4. Install the new N75J J valve in the exact orientation as the old N75, with the longer of the two side-facing fittings facing toward the intake tube. Use new hose clamps to replace the non-reusable units on the two previous hoses. Re-attach those two hoses, grasp the first hose clamp with pliers to release the pressure and slip the last fitting into it.
5. Slide the intercooler tube back into the rubber connector and tighten the hose clamp. Reconnect the wiring harness plug to your new N75J valve.