Why does my 2003 Pontiac Sunfire have a cat-back that y's into two mufflers? Can it be replaced with a single muffler and cat-back without effecting exaust flow from motor?


Asked by Dec 31, 2013 at 01:52 AM about the 2003 Pontiac Sunfire

Question type: Maintenance & Repair

My manifold has only one pipe coming out so i do not see the logic in two mufflers unless it is purely for looks and added expense to replace

2 Answers


My 2000 Grand Prix is the same. Probably just for looks. To make it seem sportier. As long as the downstream oxygen sensor is left in position I see no reason why you couldn't. Although the cost of custom bending the new exhaust pipe might be the same or close to the cost of replacing the exhaust with the "dual" set up. HTH. - Jim

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Norm Davis

There isn't room under the car for a single muffler that will create the sound/performance the car needs to run as well as it can. You can get stock or performance pipe replacements online. A single exhaust and single muffler will work, but you might not be happy with the sound or performance.

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