It'll definitely be necessary for spray, I may even need it to spray with my ar, which is why we put a gate on the intermediate. What housing are you looking to go with? Any chance you can put a bung in the intermediate to check epb in the intermediate compared to the boost the big turbo makes? I'd like to see some results on that, if I can drive mine harder and not have issues with back pressure then I may go to a tighter housing. But without knowing results I will just keep it the way it is instead of spending money on a housing I may or may not want to use. I know I can drive the large turbo now. When I was playing with my gates before we made 45-50lbs out of just that charger.