It seems about a dozen Porsche GT3 owners will be getting slightly annoyed as Porsche are writing to them saying that their engine needs to be replaced again. If you recall, every single delivered GT3 (785 units) was recalled and the engine replaced last year. Now a handful of cars need another replacement because of a valvetrain problem. If I was a GT3 customer and they asked me to bring my car back in for another engine replacement I would not be a happy chappy.