− Decrease quantity for Exhaust System, Mega Power R, Cat-Back, 2.756 in. Pipe, Polished Muffler, Resonator, 4.33 in. Polished Tip, use on Honda®, Civic Si Sedan, , Kit Quantity + Increase quantity for Exhaust System, Mega Power R, Cat-Back, 2.756 in. Pipe, Polished Muffler, Resonator, 4.33 in. Polished Tip, use on Honda®, Civic Si Sedan, , Kit Add to cart