New compressor housing for the EFR 7163 arrived. It's the SX-E version which increases the inlet diameter from 2.5" to 3.5", adds anti-surge ports and eliminates the integral BOV.
Reason for swapping covers was due to lower rpm (sub 4K) surging and fluttering, reminiscent of the stock MSP turkey sounds, of which I dislike....a lot.
After searching online, I've found this is a known thing with the larger 71mm compressor wheel in the compact B1 EFR housing. The SX-E housing should eliminate this along with increasing airflow efficiency.
I'm really liking how it looks, also happy there are no clearance issues between the radiator and engine block!
Will be installing a 3" to 3.5" transition coupler to adapt the intake to this new compressor housing. Later on I will probably build a new 3.5" or 4" intake.