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I have a 2005 Neon SXT 2.0l muff came off along time ago went to aftermarket muff 2 months later i noticed a rotten egg smell from the exhaust. Muffler fell off on road trip after running over a rodent in the road lol now i have this foul smell coming into the car. Whats the smell from ? Ive been told that its either the cat or the fuel injectors but these answers are from parts counter people lol i would rather ask you guys lol please i cant stand the smell and just bough a stock muff from napa for 62$

A muffler simply muffles the noise. It doesn't have a filter in it that will make the exhaust smell any less than it does. That being said, unless you are running fuel high in sulfur, that smell is generally caused by the engine running rich. Any codes (CEL doesn't have to be on to have codes)? Worst case, it's a bad cat.

No codes I own a code reader the only code I had was a cps and am replacing it tomarow

do you have a capacitor in the car? (one for a stereo system?)

No on that as well im in the process of replacing the Camshaft position sensor rite now lol well see if it helps

so far so good you guys i have installed the new muffler and then installed the Crankshaft position sensor started it and ran it a bit full throttle in park and no egg smell can it be possible that the CPS of caused it to runn rich??? It was tossing that code and it was cracked and leaking oil on the bottom left mounting hole thanks for all the help guys and once i dive it home 20 mile trip ill let you know if its still eggy

It is possible it was working well enough to run, but the fuel injectors might have been out of phase with the cam. (Not injecting fuel on the intake stroke). It would be more of a low rpm issue, but you prolly wouldn't notice the smell cruising at 65 mph anyways.

The fuel would be settling out a little as it waited for the intake valve to open to pull it into the cylinder. This may have thrown the combustion off enough to give an incomplete burn.

But only time will tell if it did clear up.