[thumbster]

Originally Posted by dadriva

I removed the charcoal before / while installing the TRD cai. No appreciable gains. However, the truck was brand new and only had ~1000 miles on the clock when upgraded.

It could be your truck is still too new to feel any smaller gains. My truck is just barely starting to loosen up and I have 2700 miles on my truck so far. Most people will not notice much of a difference from the HC screen removal. There maybe more physics involved in the whole equation than we can explain - the trd intake's top section is taller and might be less sensitive to the HC screen being there due to the increased internal volume. There may be other factors contributing to the HC screen's effects on airflow other than being a static airflow restriction. Some have argued it having a straightening effect on the air going into the MAF sensor tube. If anything I think it diffuses airflow rather than directing it, so there can't be any performance benefit to having it there other than to keep the treehuggers happy. So if you don't have any visual underhood inspections in your area, you might want to consider pulling the screen out. If you remove it carefully enough, you could easily reinstall it later if greenpeace gives you a call