[JAR0023]

The O2 sensor uses a supply of reference air and Bosch is adamant that this small amount of reference air is replenished via the wiring. If the body of the sensor is sealed it has to pull air from somewhere. I figure they might know what they are talking about even it I don't fully understand it.

Crimp, don't solder and use heat shrink tubing or use the supplied Bosch connector.

Can't go wrong with the factory sensor but plenty of people, myself included, have used Bosch part number 13913 (1986 Ford Taurus). Cut the ford factory connector off the sensor and splice it into the factory Porsche harness. If you stagger your splices you won't end up with a lump in the line and you can reuse the factory heat sleeve. I've got around 10k trouble free miles on this set up. -J