1 bar may be pushing it. I mean it has been done on stock B18 blocks, but if you were to do that i'd have some cash put away when the engine lets go.

The standard Honda MAP sensor only likes up to about 11psi boost also, so that would have to be changed. Depending on what injectors you have you may need to change them also. Cant think of anything else off-hand (i'd still advise doing pistons and rods for 1 bar, just to be safe)