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Well, there is definitely a problem with people thinking that making it bigger will make it better. A lot has to go into the calcs, including the VE of the engine, the rpms where you want the power, camshafts, intake length, etc etc. All this goes into designing a good performance exhaust. Some aftermarket companies just make everything bigger, which if coupled with 0 changes to the engine usually net a decrease in total power. Turbo engines do operate under different principles. The critical portions are the header/manifold up to the turbo, which people typically leave alone, and the pressure difference between either side of the exhaust turbine, which dictates lift on the blades, which effects rpm-boost-power, and so on. There are points of diminishing returns, where the bigger pipes net no increase in power.
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