JDub
Active member
Jdub I am curious to hear about your experience with that turbo feel free to pm me about your setup if you don't mind
Box S366 moves about 80lbs-min, the 67.7FMW is closer to 91lbs-min. So their is enough air to potentially support 100+hp more than a S366 can, the 67.7mm is also substantially lighter. The 'box' 366 cover isn't thick enough to be machined out larger to accept the 67.7mm wheel, so a different cover has to be used.
But personally, I think the S300 67.7FMW paired with the 73/80 turbine is a match made in heaven. Runs really strong on my Duramax.