for the 03 se to have dual outlet exhaust would i need to get the camaro/firebird muffler style or split it after the cat with a y thing and get 2 mufflers??

Why? Cars of your generation carry stock mufflers into the High 13'*.

sound.....and i have a magnaflow hi flow cat sittin in the garage would i benefit at all from putting it on??

Either or, take your pick. I've only got 1 "muffler", right after the cat, before the split. Others have two after the split.

The car directly above me has 3" exhaust and can actually support the flow.

Your SE will gain no power from a muffler change. 2000 and newer bonnevilles with dual outlets don't use the same camaro/firebird muffler the 92-99'* do.

You have a Y and two seperate mufflers on the SLE/SSEi.

maybe this should have been in detailing/appearence :?
but if alls i want is sound and maybe some nice dual tips
which way would be the BEST to go (already have the magnaflow hi-flow cat)

You have an SE, so I assume you don't have the Y. I'd think adding the Y would be pretty far out there price-wise for sound.

You have a single muffler, right? Replace it. With a Magnaflow, Flowmaster, Hooker, or something else.

Best way to go would be just replace your stock muffler. If you really want to surprise people with sound, put in a cut out.

and a cut out is??

He was joking. A cutout would make your car sound like ***.

Opens the exhaust WIDE OPEN by pulling a cable or flipping a switch.