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Exhaust Flow is crucial for the performance of your air-cooled modified industrial engines. On our time on the dyno, the stock exhaust restricts power far more than the factory air box. In fact, unless the factory exhaust is removed, changing the factory air box has no impact on performance. Changing to our high flow staged header, you gain instant torque and power.
For the best performance is to run the header without the muffler. If noise is a problem, then we recommend the less restrictive 4106 RLV B91MO 1-5/16, but for the quietest muffler, you can use the 4104 RLV B91XL 1-5/16". Due to the muffler weight and length of the header we highly recommend using a reinforcement bracket on the muffler or header to prevent damages to the header.
Stud spacing on header flange is 1.75" center to center. This header fits the Predator 212, Tillotson 196, 212, 225, Honda GX200, and most other clone engines.