I converted my 1.6 Gti to a Mi16 a few years back, stripped and caged it
It was awesome, never met much that could look at it
I have a pic soewhere of the speedo right round and stopped by the trip meter button (private road obviously)
The conversion really is a piece of cake also, it drops straign in on the mounts, a wee mod to the exhaust manifold and the rad, swap the looms and away you go.
The lift off oversteer is caused by the rubber rear axle mounting bushes, I swapped these for some ally ones and ploblem solved, it could be provoked but was much more predictable.
It was however very troublesome and you were never out of the guts of it, hence I sold it to some bloke form London.
www.205gtidrivers.com is a great source of info