These Maxi-Light connecting rods are specially optimized for the lightest possible weight while maintaining excellent strength. Lower weight means stronger high RPM performance, freer revving and quicker engine response. These rods work great for NA, supercharged and moderately boosted turbo engines. If you're building a killer NA engine for 200+ whp and 9000+ rpm these are the rods for you. At 465g each they are 15% lighter than stock rods.