There is no one "best" exhaust. The engine is a complicated system and all the parts have to work together. It depends on what other mods you have done or are planning to do.
From a practical standpoint, I have to agree with somewhiteguy that power-wise there's not going to be that much difference so go with what sounds best to your ears. If a few HP here or there is going to make that much difference to you, you need to be testing different setups and collecting your own empirical data.
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