Today we pulled the exhaust down and retrofitted the post-cat 02 sensors from the down pipes to the high-flow cats mounted mid-pipe. Note I have no downpipe cats. Deutsch conncertors were used and a custom wiring harness made to extend the harnesses about 2 1/2 feet. The 02 sensor mounts are from Vibrant. No check engine light thus far.
So this allows me to run with no DP fix, legally, pass emissions, et cetera and still have a fully custom exhaust. Hopefully the CEL will stay off. Here are a few photos of the 02 sensor installation.
Filippo
The 02 sensor harness is hung off the heat shield and run behind it along the trans tunnel:
Here's a close-up of the bungs:
Sorry this photo is blurry, but so you see where the 02 sensors live:
Here is are the Deutsch connectors used to extend the harness.