I am contemplating on doing this but i have heard good and bad.....anyone have this sport muffler on a non si........plus this muffler costs almost as much as a full exhaust so i want to make sure if it sounds ok. im not looking for a really loud exhaust and i really like the look of this muffler.

It will not bolt right in... the inlet piping to the muffler are different, so you would need to customize this anyway. Could be very minor but required nonetheless.
All the cost would not be worth it vs. another aftermarket muffler or full catback system.

I do not think this would make huge gains in power if any at all.
Maybe sounds better only, which would be nice in my opinon.