Ultra-low exhaust pressure due to straight structure A muffler that achieves a low exhaust pressure of 30% less than the genuine product with a straight structure without throttle, and can handle hard tuning that allows up to about 500 horsepower. Discerning sound By adopting a silent chamber and optimizing the silencer, the unpleasant sound peculiar to 3 cylinders is reduced, and when you step on it, you can enjoy a powerful sound that is not in the genuine product.