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Thread: What is this for?

  1. 10-03-2005, 08:48 AM #1
    93-525i
    93-525i is offline
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    Default What is this for?

    Hey all,

    I wanted to find out what the bolt on top of each of the exhaust manifolds are for? The is one bolt per manifold and it sits right on top. Any ideas?

    Thank
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  2. 10-03-2005, 08:57 AM #2
    Bill R.
    Bill R. is offline Super Moderator
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    Its for a probe that you can insert to monitor CO and HC levels before the catalytic converter, it can also be used to measure exhaust back pressure.
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  3. 10-03-2005, 10:37 AM #3
    Jon K's Avatar
    Jon K
    Jon K is offline 5-10 Grand Master
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    Quote Originally Posted by Bill R.
    Its for a probe that you can insert to monitor CO and HC levels before the catalytic converter, it can also be used to measure exhaust back pressure.

    Or EGT
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