I think they have to do it in GTI trim just to give existing 140 model owners more of a reason to change. As has been already mentioned, the 140 plus a chip can match it for power.
It mentions on the official website in the GTI FAQ section that there will be a diesel GTI with 160bhp.
Saying it is a diesel GTI must mean that it comes with all the GTI styling kit etc, and I would be very surprised if they put it on the official site before they had given it a definite thumbs-up.
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