I have a turbocharged b18a1. Its a great engine for turbocharging, and the stock internals can withstand a lot. I run 7psi daily with no problems, although i am a little rich. Before i decided to sell my car i was planning to run 12psi and make about 280whp on stock internals. I would have accomplished this with 550cc injectors, tial 35mm wastegate, and hondata s200 with some very good tuning.