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      Yesterday, 12:37 AM   #1
OneTwenty8i
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Section 1 straight pipe

I was looking to buy a Supersprint section 1 cat delete for my 128i whenever it goes on sale and I was wondering what the purpose of this thing is?
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      Yesterday, 12:46 AM   #2
tock172
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Oxygen sensor bung.
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      Yesterday, 12:55 AM   #3
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Originally Posted by tock172 View Post
Oxygen sensor bung.
Can you educate me on what this is used for
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      Yesterday, 01:45 AM   #4
tock172
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Think of it as a port for the oxygen sensor. The lambda (o2) sensors screw into the bungs. Cars typically have a pair of pre-cat (regulating, master) sensors and an additional set of post cat sensors as well. When you delete your cats with straight pipes like these, it's typical for the sensors to be relocated further downstream. You can also delete the rear oxygen sensors and leave the bungs plugged, but this will prompt a check engine light without simulators or some kind of tune.
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