I bought a 2007 GT Lusso 1.9 last year. It had all the options apart from Q2 (which I couldn't tell if it had or not even after a few months). So you cant tell if a car has Q2 or not unless you have driven a normal GT and driven a Q2 in the wet and dry. Even a track day instructor couldn't tell. My car also came with 2 exhausts, metal gear stick, facelift chrome whiskers etc.
I drove it for about 6 months then went to get Q2 added for about £600.00. I did a track day before I got Q2 at Castle Combe.
You can tell the difference, wet or dry road in acceleration, cornering speed, stability of the car, reduction in torque steer and the fact your traction control does not kick in as much (or at all unless you go BOOT in v low gear).
Its like a different car, I also had a remap from Red Dot that moved by bhp from 160 to 198 and torque from 250 to 342ft lb. I dont go crazy in mine all the time but when you need to move...... or go on a track day the remap sells itself.....yes I imagine I am using up the life of parts 25% faster but I dont have to drive to work and dont do mega miles so no big deal. If that means I burn up a clutch more than I should do..... fair trade.
The torque and handling of the car are now on another level as well....added to the look of the GT and I am more than happy. There is aninmation on youtube of the Q2 system and also a short video by the actual head of design? for Alfa Romeo driving a GT with Q2 on a track and explaining what it does, video in Italian but subtitles.