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A muffler for a vehicle is provided, including: a muffler housing having a first housing body and a second housing body that are divided in two parts and form an internal space with an inlet opening and an outlet opening when combined; and an internal structure inserted and forced into the internal

A muffler for a vehicle is provided, including: a muffler housing having a first housing body and a second housing body that are divided in two parts and form an internal space with an inlet opening and an outlet opening when combined; and an internal structure inserted and forced into the internal space of the muffler housing to be detachable from the muffler housing, and allowing an exhaust gas discharged from an engine to flow into the internal space and to be discharged out of the muffler housing through a predetermined path.

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1. A muffler for a vehicle, comprising: a muffler housing having a first housing body and a second housing body that are divided in two parts and form a predetermined-sized internal space with an inlet opening and an outlet opening when combined; andan internal structure inserted and forced into the

1. A muffler for a vehicle, comprising: a muffler housing having a first housing body and a second housing body that are divided in two parts and form a predetermined-sized internal space with an inlet opening and an outlet opening when combined; andan internal structure inserted and forced into the internal space of the muffler housing to be detachable from the muffler housing, and allowing an exhaust gas discharged from an engine to flow into the internal space and to be discharged out of the muffler housing through a predetermined path,wherein the internal structure includes: one or more baffles positioned within the internal space of the muffle housing and dividing the internal space into one or more chambers andan exhaust gas inflow pipe that allows the exhaust gas to flow into the internal space and is fitted through the baffles such that a position of the exhaust gas inflow pipe is adjustable;an exhaust gas outflow pipe that allows the exhaust gas to flow out of the muffler housing from the internal space and is fitted through the baffles such that a position of the exhaust gas outflow pipe is adjustable; anda connection pipe that guides exhaust gas discharges into the internal space from the exhaust gas flow pipe to the exhaust gas outflow pipe and is fitted through the baffles such that a position of the connection pipe is adjustable. 2. The muffler of claim 1, wherein the baffles each include: a baffle plate with one or more connection holes that allow adjacent chambers to communicate with each other; anda baffle plate support where the baffle plate is detachably fastened. 3. The muffler of claim 2, wherein the baffle plate support includes a fixing ring and a fixing bolt for fitting and fixing the exhaust gas inflow pipe, the exhaust gas outflow pipe, and the connection pipe. 4. The muffler of claim 1, wherein an extension pipe is connected to the connection pipe by a connector such that a length of the extension pipe is adjustable. 5. The muffler of claim 1, wherein the baffles include a front baffle and a rear baffle that divide the inside of the muffler housing into a front chamber, a middle chamber, and a rear chamber. 6. The muffler of claim 5, further comprising a front end cap and a rear end cap detachably mounted on the muffler housing to seal the muffler housing by closing an inlet opening and an outlet opening of the muffler housing. 7. The muffler of of claim 6, wherein the exhaust gas inlet opening pipe protrudes outward further than the front end cap, and the exhaust gas outflow pipe protrudes outward further than the rear end cap. 8. The muffler of claim 7, wherein the exhaust gas inflow pipe is fitted sequentially through the front end cap, the front baffle, and the rear baffle, and the exhaust gas outflow pipe is fitted sequentially through the rear end cap, the rear baffle, and the front baffle. 9. The muffler of claim 6, wherein the first housing body includes: a first body panel curved with one or more continuous and stepped curvatures; anda first engaging flange protruding at both edges in the height direction of the first body panel, perpendicular to the first body panel, and having one or more fastening holes, andthe second housing body includes:a second body panel curved with one or more continuous and stepped curvatures; anda third engaging flange protruding at both edges in the height direction of the second body panel, perpendicular to the second body panel, having one or more fastening holes, and fastened to the first engaging flange in contact with the first engaging flange. 10. The muffler of claim 9, wherein the first housing body further includes a second engaging flange curved in the same shape as that of the first body panel at both edges in the longitudinal direction of the first body panel, and having one or more fastening holes, the second housing body further includes a fourth engaging flange curved in the same shape as that of the second body panel at both edges in the longitudinal direction of the second body panel, and having one or more fastening holes, andthe front end cap and the rear end cap have cap flanges fastened to the second engaging flange and the fourth engaging flange, respectively. 11. The muffler of claim 10, wherein the first housing body further includes: first guide protrusions longitudinally protruding from both ends of the second engaging flange, with a height smaller than the height of the first engaging flange from the bottoms of the ends, at the lower portion of the second engaging flange; andfirst engaging grooves having a cross-section due to the difference in height between the first guide protrusions and the fastening flange, andthe second housing body includes:second guide protrusions longitudinally protruding from both ends, with a height smaller than the height of the fourth engaging flange from the tops of the ends, and inserted in the first engaging grooves; andsecond engaging grooves that have a cross-section due to the difference in height between the second guide protrusions and the fourth engaging flange, under the second guide protrusions, and in which the first guide protrusions are inserted. 12. The muffler of claim 11, wherein the cross sections of the first and second engaging grooves may substantially be L-shaped. 13. The muffler of claim 11, wherein seating flanges longitudinally protruding outward further than the second engaging flange are formed at the first body panel,seating flanges protruding outward further than the fourth engaging flange are formed at the second body panel, andthe front end cap and the rear end cap are fitted on the seating flanges. 14. The muffler of claim 12, wherein the ends of the first engaging flange are disposed inside the first engaging grooves to block one side of each of the first engaging grooves, and the ends of the third engaging flange are disposed inside the second engaging groove to block one side of each of the second engaging groove.