Before and after a/f?

[dave_xb12r]

Does anyone know the average a/f % difference after you put an exhaust on? Is it around 10%?

 

[teh Nub]

Depending on the exhaust, you may be lean in some areas, but rich in others and if will be different for each exhaust.

 

[GatorBuell]

I had no way of seeing my a/f ratio but when I ran my bike with the exhaust and K&N the AFV went has high as 118% in megalog.