Increase TQ and HP Throughout RPM Range with XFIâ„¢ AFM Cams for GM Gen V. Revolutionary GM Gen V Camshafts from COMP Cams are designed to work with the direct injection, VVT (Variable Valve Timing) and AFM (Active Fuel Management) lifters featured in GM's Gen V (LT1/L83/L86) V8 engine. This means that these XFIâ„¢ Series hydraulic Roller cams allow users to leverage the OE Technology for performance gains. Gen V Cams feature four different lobe profiles to both create AFM compatibility and optimize intake and exhaust valve opening/closing events. COMP Cams GM Gen V Camshafts increase torque and horsepower throughout the entire RPM range, while providing excellent responsiveness and mid-range power over stock for across-the-board gains. These cams must have the COMP Phaser Limiter Kit (Part #5456), which limits the range of Camshaft movement from 62 to 22 crank degrees thus requiring PCM tuning. COMP Cams GM Gen V Camshafts ar e available for stock to highly modified Applications.