I think you willl want to do your Koni upgrade to the expected GT as well. I still remember the nose heaviness pre-suspension upgrade. However, fitting a Q2 alone makes a remarkable difference to the handling, if not alone for the fact that on 18" alloys you end up following every crack in the road.. From my experience of driving a GTV V6, you are a lot lower to the ground, and the car feels of course a lot more compact. The more spacious GT separates you that much more from the road, and loads of space. Performance wise, you may not notice much difference, however this depends on all the rest done to the car (exhaust, chip so on)! A stock GT V6 will shock you as to handling, in our winter time, you are forever wheelspinning at junctions on the crispy surfaces, since the car can't get the power down evenly through the wheels. However, given your climate probably not a problem. As well, with the VDC turned on, you will see the light flicker every so often perhaps, dependent on your driving style. I was highly surpised by the available seat rake and adjustments in GTV, the GT probably can extend a little further back from my recollection. However compared to the Brera, even the GTV has more travel on the seat rails. I was very unimpressed with Brera's available seat adjustment, very cramped.