don't install a BOV on the 1.8t. Here are two reasons why: firt of all (which you already discussed) the 1.8t isnt made for a BOV. It has a diverter valve. Reason 2: ususally people put blow off valves on for proformance reasons, putting on on a 1.8t would only sound cool, not really give you any proformance - actually proformance would probably suffer.
You need to get an aftermarket diverter valve like the one from Forge. You'll get a similar sound to a BOV without the other problems.
You need to get an aftermarket diverter valve like the one from Forge. You'll get a similar sound to a BOV without the other problems.