Changing out the muffler with have almost no effect on performance. Your
Galant comes with a quiet and long lasting system that is a bit restrictive
but yours is a naturally aspirated car and you're really not flowing that
much exhaust, so the restriction is not much of an issue. To improve
noticably, a catalyst back system could be fitted but it is doubtful that
you'll find one for the Galant .
Check with local muffler shops and see about having a system fabricated if
you wish. Do not go any larger that 2.5" and keep the tip at the end of the
muffler on the small side.
Again, it is very doubtful that you make much headway towards your goals of
increased power and fuel efficiency with this modification.
Exhaust modifications are popular and effective on the turbo Mitsu's because
when you fit a larger turbo or turn up boost pressure, there is a large
increase of airflow through the engine.
For naturally aspirated cars, there is no such airflow increase.
"rcjesse" wrote in message
>I just bought an 04 Galant 4 cyl. and was wondering if anybody knows of a
>good performance, in a budget/not too loud muffler??? This is my first 4
>cyliner car I've owned and I've heard some real loud mufflers on the road
>that sound like a bumble bee. I dont like that, I want a mellow quieter
>sound that could give me a little more power and fuel efficiency than my
>stock muffler. Thanks.
> >> Stay informed about: Best performance quieter muffler ???