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Thread: What's this hole in the air box for?

  1. #1
    weister42 is offline Cadillac Owners Enthusiast
    Automobile(s): 1998 Cadillac Deville Sedan
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    What's this hole in the air box for?

    I was trying to get the serial number on my ECM today and took some pictures, what's that hole that goes nowhere for? The chamer is shaped weird on the top and the inside is empty, looks pretty useless to me.










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  3. #2
    Odin8 is offline Cadillac Owners Fanatic
    Automobile(s): 97 STS (retired), 05 STS4 (retired), 2013 CTS V coupe
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    Re: What's this hole in the air box for?

    Don't quote me on this, but I believe it's some kind of air resevoir that is used as a silencer to quiet down induction noise.

  4. #3
    weister42 is offline Cadillac Owners Enthusiast
    Automobile(s): 1998 Cadillac Deville Sedan
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    Re: What's this hole in the air box for?

    Yeah someoe on another forum told me that, it's a silencer for the air intake so it won't make a lot of noise during high revs...and I was gonna plug it

  5. #4
    Join Date
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    Re: What's this hole in the air box for?

    Increasing the volume of air.. and having a dead air area cushion the pulses created within the intake manifold. (intake valves opening and closing)

    This thing is typically called a "zip tube" here in the OEM realm. And that's all it really does.

    Generally I like to hear the induction noises. But.. these cars are not really hot rods and keeping it quiet is preferable.

    Besides.. nitrous is much sneaky-er and quiet.

    Rich

  6. #5
    OffThaHorseCEO is offline Cadillac Owners Connoisseur
    Automobile(s): 2013 ATS Premium 3.6, 1989 Allanté
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    Re: What's this hole in the air box for?

    yea, i call it a baffle, the roadmaster intake tube had huge ones so i made a CAI for it to get str8 thru flow


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