a lower compression gives you more room for error for running lots of boost before detonation. higher compression gives you more power at the same boost levels and better off boost response, but the margin for error goes down significantly. you better have a spot on tune if running anything more than 11:1 cr with boost. keep the hp levels down with that kind of compression along with a good tune and you'll have a nice motor setup.

you can easily make 300-350whp with a stock b18c1 with the right combination of parts and very good tuning.