The GT Cruiser (Turbo) will come stock with cast pistons, this a forged replacement that will allow you to turn up the boost to make real horsepower. Works with stock rods. .048 first and second ring grooves, and .141 oil groves. 8.0 to 1 compression. Also great for other aftermarket 2.4 turbo applications. Requires Total Seal Ring #X9574 or Hastings #4795