Re: Dual exhaust
i have no clue if you'll need a new bumper...i know s197's up till '09 you could slot the drivers side, but with a '10 i'm at a loss...
for the exhaust itself i'd honestly consult an exhaust shop instead of buying a pre-made kit. not only is it usually cheaper, but you can make it 100% your own setup.
as for mufflers i'd check out youtube and see what sounds decent to you...keep in mind all cameras are not made equal. from personal experience corsa's don't sound bad on s197's. however they are pricey..a cheaper quality sounding muffler is american thunder series mufflers