i have a 2nd gen s5 turbo, and have a question about hybrid turbo. I can build a hybriid with a 57 mm compressor wheel and port the wastegate. What is the max power can be made since there will be some exhaust flow issues (too much back pressure)?

 

With a stock unclipped turbine wheel... Maybe 320 whp?

 

https://www.rx7club.com/time-slips-dyno-128/11-8s-s5-hybrid-turbo-am-i-fastest-hybrid-turbo-fc-966171/page2/