Originally Posted by ibmike
Also you can install CP pistons(or other HQ pistons) over the stock pistons(which are good too)
You just need to make sure the CP pistons are compatible with the Alusil block. It's very likely CP has some compatible pistons because they've been serving the Porsche guys with similar blocks for a while. But you definitely want to check before buying. Mahle pistons (factory) are also very high quality, some say they are as good as they get. But they are much more expensive as well.