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well a turbo and non-roots type superchargers are non-linear (hence the power gains mostly at the top end with progressively larger turbos running worse at lower rpms) and therefore when the engine is spinning at say 5000 rpms the turbo could be spinning at speeds in excess of 100,000 rpms...no fan I've seen can do that...you need a turbine. Superchargers are somewhat slower because they are linear and that's why some people like them more...because they don't have a sweet spot like turbos and can be used in nearly the whole rpm range.
That little fan may add some hp, but no more than 10 I bet, I dunno even what you are talking about when you say squirrel fan, but I doubt it's capable of moving air at a decent speed.
If you want an exhaust then get some custom 2-2.5" piping and a high-flow muffler like an Apexi or another decent brand. They will give you a slight performance increase, modified powerband and will sound much better than most anything you build yourself.
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