SoWalGTI
Autocross Champion
Why don't you just dump it? I know plenty of people that send the wastegate overboard and have no problems. Side note, I am looking at big turboing my AWD(4motion) GTI and top mount is what I want to do with it as well.
Cheers, great project, very inspiring!
Open dump wastegates are a little obnoxious for my taste (too loud). Perhaps if this was a race car, but not for this build.