G'day all i am new to the forum in the son of another user here named Zeus.
so i am wanting to buy a exhaust system for my NA 3sge sw20 not to sure what is out there or what sounds good if anyone has any ideas id love to hear them
thanks everyone 

There isn't much option, and from what I've heard, they all sound like a camel farting in a milo tin

2 &1/4 pipe , custom bends from a Daadler exhuast centre  about $450ish 
 

3SGE exhaust system?
If you are looking for a different muffler for a better sound, it could be an expensive exercise if you want what to fit something that will last. (The OEM system is full stainless and will never rust)
 
Full stainless mufflers:
Many people on here have fitted a Fujitsubo Legalis R with good results.
Another possibility would be a Remus, and I have one of those fitted to my car.
It sounds deeper sound than stock, and has 1/4 inch larger diameter pipes than stock. (60 mm OD)
 
Although both of these are expensive to buy new they do occasionally come up secondhand, but still expect to pay around $500 or so.
 
 

IF you want to stay standard-ish for sound go the Fujitsubo Legalis R.
 
We tend to get them in from anywhere between $400-$700 for second hand depending on condition.