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As far as performance is concerned, I complained about a lack of torque, this has improved marginally as the miles increase, but frankly is still a little disappointing. I am very tempted by Griffos turbo conversion, but if I go down that route I will probably destroy any residual value in having a rather special limited edition model, as half of the the 'specialness' is the Cosworth engine.
If rather than a complex turbo conversion you want more torque from a simpler conversion you could always consider that 2.5 litre Omex engine that I keep mentioning.