I know a lot of the guys that work for ECS and the GM drives a 135i with one of these on it. From the feedback I've received, the valve is actually pretty solid but I haven't been in the car to be able to say yes or no.
I'm most likely going to try this charge pipe out. My mindset is if the valve blows, I'll hack the flange out and Tial it.
2007 335i Sedan
1991 Toyota Supra, 1JZ swap, T66 single, supporting mods.