We do get the K20Z1 in Australia for 2005. Rated at 154kw, or 210hp. The Integra is no longer sold as a Type R though, its now a Type S.

As for the thread starter's question, most decent intakes do provide gains on a K20A2. Apparently the CAI's do work better than the short ram's. For performance your money is best put into Hondata.