If you run higher than 11.3 psi you will need a 3BAR. The stock MAP's diaphram can implode over 11.3 and you will throw a code.

The more boost you push, the more fuel you need so be aware of that. If you're running 330 or 440 cc injectors, you will be limited by what they can spray.

The Greddy ProfecB Spec and Spec 2 both do the same thing that the XS does. 2 stages of boost (hi and lo).

SleeperCivicEX runs a greddy kit on his Y8 at 11psi and I'm not sure what his whp is cause he hasn't dynod yet. I'd imagine it's ~200whp.

As for sleeves: my Hondata tuner says that I shouldn't run over 10psi daily on stock sleeves. He said that even at 14psi only for track events will 'put a nail in the coffin' and it will eventually give at the sleeves.

I think that 11psi you should be fine. You won't need a 3bar, you can run stock internals (proven by Sleeper who runs it at the track about every week), just be sure to have the right injectors and EMS.

hih