CP Pistons line of ready to ship same day sport compact pistons has all the bases covered. From the super light weight for the naturally aspirated to the high strength low compression ratio line capable of handling the biggest turbos. Shelf pistons come with all these options as standard: deeper valve reliefs for high lift camshafts, larger valve reliefs for 1mm bigger valves, accumulator grooves sometimes called 2nd land pressure reservoir, high strength aluminum forgings, CNC machining to +/- 1 gram, double pin oilers, pin fitted, pick lock grooves for easy lock removal, and the flattest ring grooves. With over 200 part numbers, new ones release constantly, CP pistons has the widest selection of bore sizes and compression ratios. Also if you don't see it on the shelf it can be made custom with great turnaround times.