Hi
Just bought 4 O2 sensors for my 1998 2,5 Boxster, but when i was replacing them i found that my car only have 2 sensors, Pre-Cat and no Post Cat... Looks like the exhaust is original and there is no hole for O2 sensors after the cat`s. Was the early Boxsters only delivered with 2 O2 sensors and if so, when did they start using 4 per car ?