The 997 GT3 RS 3.8 hits 116.38 wheel horsepower per liter. The 4.0 hits 114.25 wheel horsepower per liter. The F430 Scuderia is at 106 wheel per liter. The GT3 RS is rated at 125 crank horsepower per liter but that crank ratings even looks conservative to us.
How about that the GT3 RS 4.0 is making just over 100 horsepower at the wheels more than an E92 M3 4.0 liter V8? Same displacement, two less cylinders, and 100 more at the wheels. Ladies and gentlemen, that is some of the most impressive engine building the world has ever seen from a production naturally aspirated six cylinder motor. Porsche squeezed out a ridiculous amount of power and 4.0 owners are certainly getting their monies worth. We do not have enough superlatives to bestow on Porsche, phenomenal.