You're still generalizing. There are duals that weigh less than singles and vice versa. So what? If you wanted to actually be correct about something you might argue that duals are sure to have one more outlet than a single, but that probably isn't worth bringing up a 16 month old thread to do now, is it?

 

How people can get so worked up about a few hp is beyond me. Exhaust setup in a NA S2000 is all about looks, sound and style (and in some cases weight reduction), the only exception to this is if you are FI at which point you will want a better flowing setup.

 

My brain accelerometer and my butt told me my single outlet
magnaflow for $141.00 installed had more torque and h/p

 

All I can comment on are my personal experiences.

Going to a Spugen dual I lost on the lowend and gained on the highend.