Can anyone share their experiences of these, or provide a Unichip dealer URL please!

Powerstation do them: http://www.powerstation.org.uk/

Used to have one on my GT4. Loved it, worked well.

Cheers

Ian

Personally I'd spend my money on something else! My one only worked properly when I added a boost controller and even then I wasn't that impressed for the money it all cost.
If I had the choice again, I'd probably try an equal length manifold as it wouldn't put the turbo under any more strain and according to reports give a similar increase in power. Also it's a simple bolt on goodie!

Steve