[SPORTcoupe]

C16 would probably hurt your performance, not help it. Higher octane burns at a slower rate, so you would have less efficient combustion..... Unless it is a NA engine that is radical or tuned to the ragged edge, I would say not worth it. Hope this helps.

:bigthumb:
Rule of thumb is you want to use the lowest octane you can get away with without detonating.

~Alan