hey mate
1) no dyno sheet..only previous owners word. yes it is laggy, full boost hits in around 4000-4500 rpm, but wen it hits..it hits hard
2) havn't done any tests on the motor while i've owned it.. but i do understand ur concern. i guess the onli way would be for u to see it for urself and do wateva tests..but being in brisbane that is a problem
3) air con is warm, i never touch it.
4) havn't replaced any belts during my 6 months of ownership. onli things mechanical i have replaced are coil packs, sparkies, and exhaust gasket.
i guess thats 4 fails lol.. thanks for ur interest anyways. and good questions.