Cosworth Forged Piston Set Focus RS Mk2

Pistons have been designed with 21mm gudgeon pins. Ideal for maximum performance with out sacrificing strength.
Focus ST / XR5 customers will need to use an aftermarket steel rod. Focus
RS customers can use OE rods without issue.

* Focus RS Mk2 engines have an OE comp ratio of 8.5:1. Focus ST engines have an OE comp ratio of 9.0:1. 
This piston gives 8.5:1 on both engine types