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if bigger better just run a 4". Think you could get a extra 10kws

All the dyno paper youve supplied are from bigger displacement or worked K20 putting out 155kws atws.
Get one on a stock b16/18...

Having no exhaust and a bigger exhaust is 2 different things.

Also that 3" exhaust is on a 2.2L. try it on a B16 with just bolt on and you'll see why they say to large will loose LOW END...