Reusable hi-flo air filters for 2.5s

If they allow more air how do you keep from running lean without a tuner measuring AFRs?
Exactly, you need a tune on Dyno after that filter otherwise issues will come up.
 
I should have searched this topic before posting. I see that @imcool posted on this some time ago...
 
If the R3 has an oxygen sensor there is no re-tune needed, there is enough latitude for A/F ratio. If the exhaust is changed also, it will need some more fuel.