Change the intercooler. GRS, PACE, RadTed and Pro Alloy all do excellent coolers.

Don't just whack the boost up, you will need to ensure their is fuel there to match. I'd also be inclined to take off the induction kit and return to the standard airbox (but drilled on the cold side) and a K&N panel filter.

If you're going to get the head done just whack on a big one speak to somebody that knows what they are doing and spec the head accordingly.