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Yes, it will affect power. Air flow = power, thus, reduced air flow = reduced power. Air will only flow as fast as the narrowest part of the exhaust will allow. This is an extreme example, but makes the point nonetheless... it doesn't matter if you install 4" pipes throughout your system, cuz if you have bend or any point were it reduces to 2", the entire system will only flow as efficiently as the one 2" section will allow. That's why mandrel-bent piping is always better, cuz it keeps the diameter of the pipes consistent over the entire bend. Unfortunately, Mandrel-bending isn't typical practice for custom fabricaters. Traditional pipe benders (which is what most shops use) essentially pinch the pipe at the bend's apex, thus reducing the actual size.
However, if you got a Y-pipe with a 2.5" inlet and dual 2.25" outlets, that would work fine.
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