Briggs & Stratton World Formula Exhaust Manifold Header - High-Flow - LO206 SpecFor racers who demand maximum exhaust scavenging and thermal efficiency, sourcing your components from a premier karting store ensures you get the exact track tested hardware needed to dominate. The Briggs & Stratton World Formula Exhaust Manifold (superseded to 557164 from 557045) is engineered to channel spent gases with zero hesitation, creating the precise vacuum pulses required to pull a fresh air fuel charge into the cylinder. Engineering the