Is it manual or auto? The 2005 ba got the 6 speed manual which is solid. If its the auto you can have some problems, They still carry the 4 speed auto which can give way especially if the car has been modified to get decent power, which seem likely since he has boost gauges. So just make sure the car is still shifting hard between gears. Find out if the car has had a custom tune and to what power, I wouldnt wna buy an auto BA that's holding 250rwkw+ with no modifications to the trans. How many kms? The rear diff bushes very commonly need replacing after 100k kms or so. Just listen out for any noise at the back there when your driving.