SML: Exhaust Pipe Diameter: 91 Sentra 1.6

[Swiney �]

What is the ideal diameter for exhaust system for this car ('91 Sentra 1.6L) 
for best performance?  Sound level doesn't matter.  Does it matter what the 
diameter is if there is or isn't a muffler?  ...or if there if a cat?  ...or 
both?
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