thanks for the comments guys, makes it kinda worthwhile!
for anyone who cares here is a brief spec of my homebuilt, and home tuned engine:
Clio 172 block and cylinder head,
83.5mm crank (clio 16v, volvo 480, etc),
Standard 172 pistons (bet you didn't think they were this touch eh ?),
172 camshafts, re-timed,
1794cc, 7:1 cr,
Custom tube exhaust manifold that I made from cutting up an original 172 manifoild,
Huge T04E turbo running 24psi,
Tial 38mm external wastegate with screamer pipe exiting front wheel arch,
503cc cosworth grey injectors,
3 bar map sensor,
Adaptronic race engine managment mapped by myself,
3" downpipe and custom exhaust
It makes about 360bhp in its current state, the compressor and injectors are maxed out now. I'm looking for some 800cc injectors and I have a bigger 50trim T04E compressor on order, that should see it to 400hp ok.
I'm shocked the gearbox has held up, which is a STOCK 172 gearbox!!!! it whines a bit in 4th now, but still functions ok. I suspect it'll pop soon enough, at which time I'll look at ways of making an o2a VW gearbox fit, they're tough as hell, and there's a big choice of ratios for me too.
Chris