“I Bought the Speedometer, I’m Gonna Use the Whole Speedometer” The ABT RS4-S takes the new facelifted RS4 Avante (little brother of the RS6 Avante) and crams in a ton of performance and visual upgrades to bring the 2.9-liter twin-turbo V6 from 450 horsepower break the 500 mark (503 HP). You also have the option…