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I guess your car is a -89
The new pipe is a "sparepartversion"
That 15mm whole you'r discribing is not for the O2-sensor, you have to just plug it.
The O2-sensor is moved to the catalysator. You have to remove the catalysator,
drill a whole of about 26mm in the left front of the catalysator, and weld on a "nutpiece" for the O2-sensor. The Volvosparepartnumber is 3531545. You have to be careful so you not damage the catalysator, it's expensive. I suggest you talk to an auktoriced Volvoverkshop. They may be have papers showing exactly
where you should drill.
Good luck.
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