I won't get too hung up on diameter, your down pipes are 1.75", you can have a dual 10" exhaust but you'll still be going through a 1.75" tube. A better designed X or H pipe systems with less steel wool in the muffler (louder) will provide the most power increase. Removal of the steel wool from the oem nismo axle back would provide gains similar to most aftermarket system, though not sure about the quality of the sound. I've only seen one person do it so far though but it would be the lowest cost alternative.
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