Hello everyone. I replaced my stock filter with a K&N. I noticed when I did this there is another type of filter inside the main part of the box. Does anyone know what this is? Do I really need it in there? Can it be removed?

I have never seen anything like this and any help would be great. I would like to try and do a airbox mod on it without spending the $300.00 bucks. Thanks for all and any help. Aaron

From my understanding the air filter system in the FJ is Toyota standard for all their trucks and SUVs. The secondary charcoal filter is to reduce vapor emissions from a freshly shut-off engine. From an EPA standpoint, the manufacturer is probably required to install it. From my standpoint, all this does is to restrict airflow even more. I think you can safely discard it. This is just my opinion, mind you. I can't prove that it is beneficial or even legal to do so. It can only provide you with more airflow which translates into more power.

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Full speed ahead. TBall...

BIG improvement. THANKS

In what way?

Well it feels like the truck has more power. I bet it'll get better gas mileage as well. I haven't checked on that as of yet. With the k&N, and the other gone, there is not a hesitation, like I use to have.

Thanks for your reply, I'll give it a try

Also, after I did this mod, I threw away the top plastic engine cover. Why, you ask? Well, I was thinking about heat affecting the throttle body. It would seem realistic to believe that with the engine heat rising up, that the engine cover would keep that heat from escaping and would keep it up around the throttle body.

So, I decided to toss it. My Baby didn't run this good when I bought her.

Is the secondary filter in the box the one that backs up against the standard airfilter - has a wire mesh facing on it? And if it is, how did you get it out? I was looking to take it out but couldn't find anywhere to get a grip on it.