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2007 Chevy Cobalt

The stock exhaust isn't the prettiest to look at, consisting of a skinny resonator and huge muffler with all sorts of shielding around it. The stock cat pipe (or downpipe, if you will) is 2.25 inches OD. Then, the stock cat-back system (a strange bird) begins at 2.25 inches for the tiny bit fore of the resonator, bumps up to 2.5 inches for a couple of feet, and finally shrinks to 2.25 OD again the rest of the way to the muffler. It's then 2.5-inches OD from the muffler to the tip.
2007 Chevy Cobalt - Practically Powerful

 The stock exhaust isn't the prettiest to look at, consisting of a skinny resonator and huge muffler with all sorts of shielding around it. The stock cat pipe (or downpipe, if you will) is 2.25 inches OD. Then, the stock cat-back system (a strange bird) begins at 2.25 inches for the tiny bit fore of the resonator, bumps up to 2.5 inches for a couple of feet, and finally shrinks to 2.25 OD again the rest of the way to the muffler. It's then 2.5-inches OD from the muffler to the tip.  View Related Article

 

 

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