I recently purchased a 2001 Dodge Dakota 4.7L SOHC. I want to start working on my own vehicles more. But I have very little experience and this question reflects that.

2001 Dodge 4.7L SOHC V8

Please correct me if I get anything wrong. But I believe I know what #1 and #3 are in my picture. #1 is the air filter housing. #3 is the throttle body.

What I have no idea about is #2. I can clearly see that it is in between my air filter and throttle body and is connected to both by hosing. What is it and what does it do?

1 Answer 1


It's basically a tuned box that serves to reduce intake noise.

Think of it as a muffler for the intake.

  • 1
    It can also provide a plenum area where the air can slow down and get better "organized" before it goes into the throttle body. It allows the air to get smoothed out a little bit and flow straighter. Not always, but it can be. Nov 19, 2020 at 18:36
  • That makes sense. Just out of curiosity, does it affect performance at all?
    – Mr. Spock
    Nov 19, 2020 at 18:39
  • On some vehicles it does. Generally, however, they are not just a plain box like you have. Look under the hood of your Lambo and you'll see something very different.
    – jwh20
    Nov 19, 2020 at 18:42
  • @jwh20 Thanks for the info!
    – Mr. Spock
    Nov 19, 2020 at 18:43

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