I'm not sure which exhaust is better lepVince Oval EvoII slip on, Termigoni slip on or Akrapovic. Also can a high-efficiency air filter be installed without the Termigoni system?
all a matter of personal tastes on exhausts to me.
the termi does come with the new ECU and hiflow airfilter.
you can add a highflow filter with a Powercommander as well or any other system that adds more fuel, two brothers juice box, etc.
people could post their results and pics for you to compare