I asked the seller and here's what he said
Hi,
It would be better to lower the compression. It would work on a stock engine but possibley without much gain.
The eaisest and cheapest way to lower the compression would be to use 2 headgaskets, or a thick copper plate sandwiched between gaskets. these come on on ebay in the US quite often, are are fairly eaiser to find on the net.
The original turbo technics used offset small ends on the rods, weird way of doing it.
You will need to find somewhere to take the oil feed from as well, but thats no major hassle.
Power wise, you will be looking at around 200bhp - i think the original one was just under - stealth racing took over supplying the kit when TT stopped - they modified it slightly by using a different ecu and another set of injectors - i believe they got it to around 210bhp.
Biggest gain is in the low end torque - you'll end up with a car that has the low end grunt of an 8v with the top end power of a 16v. Its quite a smooth progression - not a masssive shove in the back that you'd get with a bigger turbo. Very driveable.
Hope thats of some use,
Tom.

Not really tom no, a tuned 2.0 16v shoud do that without the turbo

nah i think i'll stick with one of these
http://www.eiptuning.com/eip/16vturbosystem.html 