Need some help in picking a exhaust was looking at at
Dtm twin uplift pipes,
Oval single uplift,
Straight twin,
Boxster oval,
Or a single in sizes 3" 4" or 5"

I have a fiat stilo 1.6 with factory bumper
So what you guys think would look the best

Unless the car has something to back it up, I'd just fit a standard replacement exhaust. Few things are dafter than slow cars with fancy exhausts.

There is nothing wrong with better looking exhaust tips rather than original, even if ain't "modding" your engine.
As long as you choose not so aggressive exhaust tips etc if you can put your foot into exhaust end tip, then its too big for 1.6

i am having a twin 3" outwardly rolled stainless back box put on mine soon, just for looks mainly and the fact the old back box is on its last legs

The trick for me with any exhaust is subtlty. No point putting a can on that you'll hear from miles away. That was acceptable in the '90s (along with small rims and floor-level slams) but now a loud exhaust just makes you look a pillock. There's a real difference between 'volume' and 'throatiness'. A nice deep tone without the 130db ear-shredding volume.

Totally agree with replacing OEM for stainless though.