Put it this way. They type r motor makes 190 stock. The GSR makes 180 stock.

Even if i was going stock to stock 10hp is not worth the extra 1000-1500 bucks. Go with the supercharger and be faster. When you walk a car with a stock c5 youll be thanking yourself. But he will be so much jdm tyte cooler than you it wont matter. FUCK EM.