well the bigger piping, cooler and plenum increases the overall capacity of the system, so more air has to be pumped before you get boost.
the benefit of the bigger cooler and piping is the cooler will usually cool more effectively and the big piping can flow alot more air, but to outflow 2.5 or 3 inch pipe you would be moving a massive amount of air.
the bigger plenum is good for something which im still catching on to, something to do with even air flow etc...
cheers, andrew
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