From all the reports I can find. It looks like the next GTC/OPC Astra models are going to be 5 door only..

As well dropping from the 2.0lt turbo to a 1.6lt turbo. Though with more power. So wonder if the GTC & OPC will share the same engine?
But with different power outputs.. Has anyone else found any more info??
Will need to wait till the 2017 Frankfurt Auto Show in September

http://gmauthority.com/blog/2015/09/...in-its-future/

http://gmauthority.com/blog/2016/03/...o-push-300-hp/
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