Exhaust System for an Engine and Motorcycle Including the Exhaust System

摘要

An exhaust system for an engine that reduces muffler weight, assures a silencing effect and prevents a leak of exhaust gas. A muffler has an inner cylinder disposed in an outer cylinder, and is separated into a plurality of expansion chambers. A communicative passage for communicatively connecting the expansion chambers together is formed between the outer and inner cylinders. Edge parts of the communicative passage contact the outer cylinder and are welded thereto.