Spoon Sports 4-2-1 Exhaust Manifold HeaderThe ultimate Spoon exhaust manifold, the 4 2 1 manifold, has been meticulously engineered to optimise torque and power for high capacity, naturally aspirated Honda engines with elevated RPM capabilities. Rigorous flow and performance testing have been conducted on the headers, with torque and outright horsepower being perfectly balanced to provide the most substantial performance gains achievable. Slightly unequal length runners were found to provide