CP has built a reputation of high end quality pistons, build to perform and out last; especially in the powersport and sport compact markets. They are recognized as a technological leader in piston design and development in all venues of motorsports with a focus on providing industry-leading products and performance while maintaining the highest level of customer service.

The piston is the weak link in the stock STI block. These are great for someone either reassembling a their block or someone looking to put in some strong pistons in their "built" block. 

Throw these forged high strength aluminum pistons in and turn up the boost and get more power from your STI! These CP pistons have been put through rigorous testing. In short, they are build to withstand nearly whatever you can throw at em'!