Hey 2nd gen owners,
Not really a how to, more so an FYI and it seems VERY simple.
Came across this whilst perusing the DT website the other day and thought it'd be a good thing to stick on here. They say "by doing this with every oil service, you will not need a carbon blast down the road, and you car will not loose performance over time because of build up!" After I get my intake valves cleaned this year at the Dragon I'm going to start using this as preventative maintenance. They provide instructions.
This kit is specially designed for the N18 motors that can not use the vacuum port on the valve cover like the N14 motors. The N14 motors should use the pour in Sea Foam. For the N18 motors. Loosen the boost tube hose clamp on the passenger side, and using a screw driver, get under the hose carefully and free it up. Once its free, use the screw driver again to give you some room to insert the spray adapter. Get the red tube as far in as you can, but makes sure the plastic loop is under the clamp. Reattach the clamp to prevent a boost leak. This is now where you need two people. At an increased idle, 1000-1500 rpm's, spray the whole can into the intake path. Once the can is empty, turn the car off and let it soak for about 5 minuets while you remove the adapter and make sure your boost clamp is tight and back to factory look. Restart the car and run it at an increased idle till all the white smoke has cleared. We recommend doing this out side.