Hold your horses there ;)
If this thing is a P-reg Turbo for one thing it may be rarer than rare.
MR2 turbos were only ever sold in Japan and I have never seen one that new over here.
There may be issues with importing a car after a certain year that hasn't got a UK equivalent, which the MR2 turbo doesn't.
I had a K-reg (rev 2) 300BHP turbo before I bought the GTi-6.
I suspect it isn't the turbo at all but the N/A which was still being made in Japland and here till quite late.
Easy ways to tell.
The raised bootlid (Easy to change and lots of people put the turbo ones on because they look better.)
The car may say 16v turbo down the black stripes along the side of the car (stopped on later revisions I think)
There will be a boost gauge in the dashboard.
The acceleration will be close to super car fast and tear your face off
I miss the power in mine, nothing could get near me on the roads - I even made a Volvo T5 and BMW 645 look slow
It was a dangerous car in the wet though, very twitchy and with the hybrid turbo running raised boost levels when the turbo boosted you had better be facing in a straight line on dry roads or you were in trouble
But using £20 of petrol (99 ron only) for every 80-90 miles got a little expensive

My 300ZX twin turbo was even worse
*Goes off to stroke his awfully slow but fugal HDi*