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On a 2001 2.7, changing from factory to a 2004S muffler
made a very noticeable difference.
Mostly at low car speeds -- much beyond 50, the wind noise
overshadowed the sound.
But quite pleasant at lower speeds. Not loud enough to suit
me (like the '07 Sport Exhaust does), but definitely different.
And worth doing if you get a cheap/free one.
So if you get your hands on one for the right price, it only
takes an hour or so to swap them out. And, no, you do not
have to take off the bumper.
That said, I can't answer your specific question of a 2.5L
to an '03S.
Best,
- Mark
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