Mario,
No matter how I'm going to ignore answering your question, it's going to sound rude and unhelpful, so I might as well embrace that.
You have an '04. The muffler on my '99 is perfectly fine...it does all it's supposed to do. If yours isn't broke, I suggest, highly suggest, you find a place for your money where it'll make a difference. Don't tell me your car is perfect. I haven't seen it, but I know it isn't. How, you wonder, is that possible?
It's possible because I've been here much longer than you, have thousands of posts and obviously no life. Although I've written 14,000 posts, I've read many, many more. I know stuff.
Thus, for instance, I know that your air pressure isn't correct, that your cooling system will fail in 37 days at 7:43 a.m., that your ofhg is leaking, your valve cover is leaking, your PS lines are leaking, your refrigerant is low, your pulleys are bad as are your belts, you haven't even looked at your subframe, you need new plugs, your wiper blades are due for inserts, your left rear window regulator has about 3 days before it fails 100%, your battery is only putting out 60% of the amperage the car needs, you'll need proper brake pads, and finally, I think you kind of get a little excited when you polish your wheels, if you know what I mean?
Also, btw, I'm not a d!ck...that's Speedskter! I'm just old...really old. So old you really shouldn't take offense to what I've said because when I die tomorrow, you'll feel badly for a day or two if you say what you're thinking of saying!
Turn off your stereo, use the right pedal, and your car will sound great.
Too much, guys? :lmao: