my
problem is i get bored exstreamly quickly and want more power

hopefully this is enough to keep me happy

how much roughly does pistons valves and rods cost? as eventually i hope to get these changed?
I did'nt see you were getting the BT conversion in any other posts so just read through all this. I would say 350 has got to be your limit surely in the mk4. not from a tuning position, but from a drivability situation. I would say that once you have had that all done you will need to spend money on making other things more reliable and tighter. Surely some monster money on suspension set-up and chasis set up will be of more use than ringing out even more power.
a Quaife ATb would also be of a lot of use too.
I mean picture this, pull up to some lights on a damp evening, boyo pulls up next to you in a corsa. lights go green and said 1.4 corsa wastes you off the line. Why? cos you're sitting there spinning like a *****.
My mate has a corsa 2.0 turbo, and its about 300 bhp, sound great, looks fun, but it is such a pig to drive as all it ever does is spin up.
Thats where your money needs to go afterwards, getting the chassis half close to coping with that power, but i doubt its cheap. You only have to look at what Bill and the other BT boys spend on all the fancy tech stuff they add on.
But watching this very interested and hats off to you for being the first to do the mk4, i know there was another guy who harped on about doing it Chris cupra or something, but he never went ahead with it, i think he bottled like so many others have.
keep us all posted on this