Upgrade the weak links and pistons in your block and keep your engine together reliably with HP's forged connecting rods and forged Pistons when you aim for more than 1000 horsepowers! 3, Lighter design, with our new designed 143mm H-beam Conrods for M104, the total weight of Piston and Conrod will be around 250g lighter for each cylinder, imagine what kind of response and rpm you can get.