I talked to Webber racing, and through a little research of my own. I don,t think that tunning is easy on these cars. Either a 2k standalone, or burn chips. The chips I hear are close if you have someone burn it that has been doing it for years.
They tend to eat cams according to Webber racing. The pistons were cast from the factory. The piston has steel and aluminum in it, that leads to cracks.
To some it up, if the car is stock with factory pistons in it, they are most likely cracked due to the age of the cars.