(2.2L Ecotec Only) Built for the Pontiac Sunfire... "ESP connecting rods are forged form 4340 steel and utilize ARP 2000 bolts with alignment sleeves for a perfect fit. Packaged in weight-matched sets (+/- 2g). Sizing is done on the state of the art Sunnen Krossgrinding system. "ESP" connecting rods are the perfect choice for high horsepower applications, some applications up to 1500HP (typical 500-750HP).