Installed because I felt OEM filters were always limited. The whistle everyone is talking about reminds me of the days when I installed a conical air filter to keep cold air intakes out. It has a small suction pipe similar to a turbo. I LOVE IT! it definitely wakes up the tundra noticeably. I was going to put in a cold air intake but this fulfills the same sound, very loud, not $300! I think I'll stick with this setup for now. There was an odd activated charcoal filter in the box, which I also easily removed with a flat head screwdriver. I would definitely recommend if you want a throatier sound.
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