I have noticed that my exhaust smells. I park in the garage and when i turn the X off and open my door I can smell a distinct smell of exhaust/rotten eggs. Do you think I need to replace my muffler? Could it be something else?

How long would you say your car is on and running while you're in your garage before you turn it off. Could be exhaust accumiliation. You can usually smell a little bit of exhaust when parking in it. Unless this seems to be a strong odor, check your exhaust manifold/cat/muffler

catalytic converter

The smell is always there, even if I just part outside and turn the car off. I was thinking catalytic convertor but wasn't sure. I guess I just need to have it removed and have a magnaflow muffler installed and be done with it!

The smell is always there, even if I just part outside and turn the car off. I was thinking catalytic convertor but wasn't sure. I guess I just need to have it removed and have a magnaflow muffler installed and be done with it!

Is there a significant exhaust note difference and performance increase with a Magnaflow? I was considering getting that or a Flowmaster depending on t he performance increase :-p and if it has a nice exhaust note.

cat converter. its not the muffler. the muffler "muffles" the sound. your cat eliminate toxic fumms. check that

"Rotten eggs" smel is Sulfuric Dioxide that is released from your exhaust due to cat. converter's inability to process the fumes that are comming out of your engine.

In most cases, the culprit is the cat. converter itself, or one of the sensors on cat. converter.

However, the smell can also happen when cat. converter is OK, but the engine is not burning the fuel properly (i.e. cylinder misfire). I witnessed the problem with "rotten eggs" smell, where the problem was actually in cylinder #1 not firing. The mixture of gas was "too rich", and cat. converter could not deal with it, hence the smell.

I'd advise you to hook up your X to engine code reader, and find out two things: whether "check engine" light (engine monitoring) is working properly, and if there are any codes shown. If the vehicle monitoring system is working OK, and you have a code - look it up, and you may be able to find out what the problem is.
If there are no codes, and the monitoring is OK, then you may want to try to change the petrol provider, or perhaps using one of those fuel cleaners, just to see if it's going to make any difference (I heard that something called "sea foam" is doing a good job on import engines, however I still haven't seen that product in Canada, where I live).

Good luck.