So BNR is soon to start shipping out the second version of the BNR S4 turbo.
The differences between the v1 and the v2 --- > ".70 ar 3.5" inlet with anti surge port on v2. .60 ar 3" inlet on v1. V2 should spool faster and have improved mid range along with a louder sound. Same max output." - BNR
The differences between the v1 and the v2 --- > ".70 ar 3.5" inlet with anti surge port on v2. .60 ar 3" inlet on v1. V2 should spool faster and have improved mid range along with a louder sound. Same max output." - BNR