it's not just a case of a turbo'd ar but more of a large increase in power from the standard engine. To be honest i don't think they do a hell of a lot unless you're putting out an extreme amount of power that the clutch just can't handle. Something like 200bhp+.
what power would you get from a trubo'd 1.4 then anyway?
not sure if it is the same clutch as the vts.