Thanks for the replies chaps.
Think i'm gonna try sourcing an inlet manifold from eBay, looks like they come up at reasonable cost in Germany now and then, so that's the first part of the plan, could be a bit of a waiting game though.
Supercharger looks a good option, but way out of my budget.
Definately a Z22SE
Matt, over the moon with the Chipped UK remap, it made such a huge change as far as driveability is concerned. Didn't go for masses of bhp at the time, but i'm sure there's more there to be had just from remapping. As explained in another thread, I was down on power on the last power run due to coolant and ambient temp problems. Now that's sorted I think it would dyno close to 170bhp now, so that's just about another 30bhp to go to hit my target.