I just thought I might post my setup for any who may be interested. This is my former daily come track toy which I have owned for several years. Over the years I have tinkered somewhat and it slowly changed into what is it today. Here is an image of the engine bay, it is basically a 1.8 with rods and pistons, a little light cleaning up of the ports, stock exhaust cam, inlet has exintake mod, a garret GT2871R with tial 0.64 v band rear housing for response and tial MVR 44mm wastegate. The turbo is low mounted on a steampipe manifold made by myself with full 3" exhaust from turbo to tip. Just running on 98 pump fuel.
It was making about 170rwkw/230rwhp on 12psi already and I had it retuned last week so it is now putting out 235rwkw/315rwhp at 18psi and is a hell of a lot of fun to drive with massive torque and awesome instant response! I don't currently have any plans to up the power as it is already around the level where gearbox and diff are said to start being an issue however I do believe there is a fair bit more in the setup if desired as we still haven't played with cams or cam timing and it should take more boost fine too.
Dyno attached below, I think the few lower lines are just from earlier runs as the tune was playing around with boost control etc.