I like both...
my fist mufler was a peco straight threw centre exit up sept type...sounded great..
ive had rc40 comming out the left hand side too....and also a twin dtm 2 1/2 in tip item was originaly straight threw centre exit but was a bit lound so my exhaust place made it come out the left side rear like normal and it was a bit quitier...
Ive allways had to systems on hand...
one quite.. daily driver and one weekend witch was the twin dtm item.
just took 5 min to emoe and swap too...

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started a new project...there goes all my free time....

Personally either, my wife has a centre box twin exit peco(i think) muffler and 2 1/4" centre pipe with a real deep grumpy sound and i have 2" pipe with a hot dog and side exit and its has a really bark to it.

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http://www.youtube.com/watch?v=nDMkVq1jRGU

Out the side with two inch stainless

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mine's bigger! lol

twin 2.5" side exit.

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-James.

Toyota 4EFTE Powered Minivan.
102 Kw @ The Front Wheels....Oh What a Feeling!