If you like your engine, keep your boost right where it is.If you want an expensive rebuild right now, up the boost to 12psi.Your engine will blow with 10+ psi. Maybe not today, but very soon. Especially with the Star fuel system. People have run 12 psi on stock internals, but they decreased the CR with thick headgaskets and shims. *so don't do it -Jeff1999 Mitsubishi Eclipse GS-T'd and HRC'dhttp://gs.dsmpower.com