Nobody's backed up the clams because they don't have the parts to test. There's nothing magic here though. It's just a short connecting rod with an adapter to

Nobody's backed up the clams because they don't have the parts to test. There's nothing magic here though. It's just a short connecting rod with an adapter to use your old pistons with the lower pin height. They could have just sold you new pistons with the lower pin height, but they'd be specific to this combination. Connecting rod length changes piston acceleration and dwell time at TDC. A short connecting rod means faster piston speeds but less dwell. The faster piston speed means more suction when the piston moves down the hole, which will increase cylinder filling. It also means more stress on the piston. The reduced dwell time means less time at TDC for the flame to spread before the piston is being pulled away by inertia. Which gives you less time to burn the fuel. The dynamics are known. Short rods will make more power, but you trade off things like reliability and fuel economy. Something you're willing to trade off when making a drag race engine, but OEMs need the engine to meet CAFE standards and run 200,000 miles on crap fuel. The real issue is the part that drops the pin height on the piston. It's sketchy to begin with, and the short rod and extra leverage from the adapter means more stress in the same areas it's likely to fail at.