Quality im wanting to take mine to 280 bhp and hold it reliably at that power ive seen you said 6k but would that inc rods and pistons etc mate and brakes and suspen cheers
The 6K I mentioned was based on:
2K for the parts to turbo it
2K for rebuilding the engine
2K for gearbox / diff / clutch
Obviously you may have labour charges on top of that depending on what you can do yourself, in my case I did all the labour (with mates helping me out) and the mapping only cost me 50 pounds for an hour on the rollers and 50 quid for a tank of fuel as I do all that myself too so did most of it on the road and just finished it off on the rollers.
Potentially if you wanted someone else to do the whole job for you labour wise including the mapping, it could add another couple of grand, so best thing is to do the bits you can yourself and then just pay for the skills you dont have.
A sensible first step would be to turbo your existing engine for less power, like 230bhp or so and keep the torque modest and then you can survive on a standard clutch and diff and still have a fairly quick car, then as budget becomes available uprate the engine and the gearbox.