I finally got rid of K&N drop-in filter and installed Apexi power intake.
I've read some articles that I may retune for intake.
But I've never noticed much difference between two except a little better top end and about 10x bigger sound with apexi.

What do you guys think?
Should I add more fuel at the bottom since intake flows sucks more air? or since apexi doesn't replace maf pipe, could it be ok?

I'm wondering what other tuners do when they retune ECU for intake.
Any help will be appreciated.

 

do you have any type of logging tool? how do you plan on tuning this intake if you dont know when and where the motor wants more or less fuel/timing. Until the stock intake becomes a restriction an after-market intake prob. wont yeild you much; if anything you will some gains in the higher rpms were the engine wants/needs more air.

 

I logged using poket logger but didn't find any difference in O2 reading and timing from before.

 

well, that prob. means your fine and wont have to add/subtract fuel because you added the intake; and that you prob. havnt gained any power from it. Just wondering but before you installed the intake have you logged your air flow(lb/min i think is the ? if so log your air flow with the intake installed now, and see if your engine is getting anymore air. If so then there is potential for power gain over the stock intake box.