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In general, OEM exhausts are optimal. Less restrictive systems open up some high end power, but at the expense of low-end driveability, so unless you always shift at 5k and drive like a retard, such a thing doesn't do you any good.
In the GMC Sonoma (S10 clone) I used to have, I had an ongoing fight with the exhaust system, and concluded that I needed it to be intact not only to be quiet, but to preserve my already-meager low-end torque. If low-RPM power is missing, you are forced to shift later, thus killing your FE and ability to drive sensibly.
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