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The fan idea would probably not add much boost. Nitrous is for the drag strip mostly so I wouldn't reccomend it. Either turbo it or Supercharge it...those are your best options and those will definitely add a decent amount of performance gains.
About the exhaust, either leave the stocker or get an aftermarket. If I understand you correctly, you basically want to remove it alltogether which could cause a loss at the low-end significantly and the mid-range while only adding a little to top-end most likely. I'm no expert, but that's my assumption.
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