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Had email from Iain today - yes, he has them and will commence thorough testing next week. He's putting EGT sensors in each cylinder port on the manifold and another in the downpipe, along with pressure sensors in both up-pipe tubes, before the turbo’s compressor inlet and in the downpipe - and the compressor covers also have Turbo Speed sensors machined into them.
So, he's being thorough
I note that they are (now) described as "twin entry" not twin scroll which is a bit of a shame, maybe?
He suggested to me that they would cost a few hundred more than an MD555T - so I'm assuming approx £1500+VAT.