Air filter

If i take out the secondary filter out of the box would it throw a code

 

I don't think so, it will probably decrease your gas mileage though.

 

why is that thing there? does it ever need to be changed?

 

it will not bring in a code. I took mine out at about 10k miles, no problem so far 100k miles. does not come on 4.0 4runners at least the ones my 2 adults kids that have a 06 and 07. seat of the pants feel is better without it, but maybe just sounds off different. can't hurt anything to take it out as long you keep a good air filter.

 

i took mine out,made no difference in mileage,no codes.went to a drop in k&n,same result.no codes no better mileage.i usually fill up every tank and check it 90% of the time.

 

its a charcol filter just for emissions as well...if someone says they took it out and feels a difference in power is full of it, just leave it in.

 

I agree...there would be no difference in power at all. Leave it.