Thanks TT. Talking of 'T' I got some cheapish bits to see if this was going to work in the roadster with the MX5 engine.
Its a Garrett/AirResearch TBO339 turbo off a Saab 900 I got for £50, manifold was £110 delivered. Fast spool for a mild turbo to around 150-170hp hopefully.
Looks like it will just about work.
Cheers
Stot