I talked to one of the guys at FI Friday and it would seem currently FI is waiting for word back from Garrett in regards to the 37. If I understand correctly FI is having Garrett make modified cover to go with FI's wheel. FI: please correct me if I have that wrong.
I've seen (heard mostly) there is a GTX37 wheel currently in production as of last month? I've seen such over on the Powerstroke forums as a PS buddy told me about them.
The ETR-HO wheels for the GT37's have been completed. Testing is done, you guys will enjoy them. 1st batch of finished wheels will roll around 25th of this month.
In testing blowing the gate open to equalize BP. We were able to pickup 40rwhp. So around ~6.5 lbs/min. Also wheel is about 19 grams lighter then stocker too.