Since Ford shared how much power the 2020 Shelby GT500 will make, in addition to how much it will cost you, owners of the previous generation GT500 might feel it’s a good time to make some upgrades. But what if your car has more than 100,000 miles on it? Should you really mess with its high-mileage Modular or Trinity? Brenspeed, the Mod motor Mustang experts located in Indiana, got their hands on a one-owner 2009 Ford Shelby Mustang GT500 with 106,000 miles on it. According to the video, the car received a 2.9-liter Whipple twin-screw supercharger, in addition to a few other performance parts, and made 658 hp to the wheels on 93 octane. According to Brenspeed, the Whipple W175HPR, known as the supercharger of choice for the Ford Racing Cobra Jet programs, produces incredibly high power levels with the stock 5.4-liter Shelby GT500 engine as well as highly modified engines. The Whipple serves as a direct bolt-on replacement and gives the owner the ability to run higher boost levels than the factory 2.1-liter 122ci roots-type supercharger. The W175HPR Gen 3 compressors can run nearly 25 psi of boost, though at that level some engine modifications may be required for performance. Th...