RENNtech | Carbon Fiber | Airbox | M113 | 5.5L Supercharged V8RENNtech Carbon Fiber Air Box for M113 V8 Kompressor Engines. Gains: +10HP & +15TQ RENNtech Carbon fiber air box for the Mercedes V8 Kompressor engine (M113). Our full carbon fiber airbox is more than just an impressive under the hood showpiece. By allowing a greater volume of intake charge air; our carbon airbox upgrade allows for greater horsepower and torque across the entire RPM range. The result is an additional 10 HP and 10 Lb ft with increased