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Part of what has happened is the sound has changed how the car feels, just like putting a death metal CD in the stereo will make the car feel faster.
Of course the rest of the exhaust is tuned more or less for the engine, so the muffler is really the only restriction, read up a bit on exhaust design and tuning and you will see that back pressure is a myth used by teenagers that like loud cars and people who are not good at math but that a well tuned exhaust will give you more power at a given RPM then a "free flowing" exhaust, mostly because exhaust moves in pulses and the piping has to be tuned for those pulses or they slow down and bounce off each other, to large and they bounce off each other!
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