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Would removing the secondary filter in the top of my 06's air box help any? It looks really restrictive and I've wanted to remove it, but haven't asked if it would cause any problems or hurt my truck..
 

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http://www.tacomaterritory.com/forum/showthread.php?t=59003&highlight=filter

Specifically:

Gadget said:
What you are talking about is called a hydrocarbon trap.

Its purpose is to capture gas fumes from escaping into the air when the engine is shut down. It uses a product called zeolite.

I don't know about the 2.7, but I have done a lot of testing on the new 4.0 V6.

On that engine there is absolutely no performance benitit from removing the carbon trap filter. I have dyno tested that and there is no difference on the dyno with it or without it. That carbon trap is not the most restrictive part of the intake on the 4.0. The most restrictive part is the airfilter box its self. We have fixed that with the new URD TCAI intake system.
 
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