If you're looking for increased performance and durability in your piston rings, consider the Mahle S41768.040 Piston Ring Set. These rings are designed for 7.3 Powerstroke engines from 1994-2003, and they feature an oversize of .040". This means they'll provide a tighter seal than standard rings, resulting in increased compression and power. Each set is sold individually, so you can replace just the rings on the pistons that need it. And because they're made by Mahle, you can be sure you're getting high-quality parts that will withstand even the most demanding applications.