Wyvern 4-in-1 Titanium

[PowerDubs_imp]

While it is true that these dyno charts are wide open throttle power- generally if the bike makes more power at any given place than before, it means the bike is more efficient at moving air at that RPM.

So minus any velocity differences inherit just due to sheer volume of airflow delta between part throttle and WOT- it is probably a safe bet to make the choice of the exhaust that makes the most power for the RPM you ride in the most, even if you aren't concerned about power and never crack the throttle past 1/4.

We could argue that an even smaller diameter pipe- one small enough to hurt / make less power than even stock at higher RPM could have more velocity at very low part throttle therefore giving it more economy- but that you would still want that smaller theoretical exhaust to be free of pumping losses such as the cat and choked off quiet muffler.