Looks neat.

B6 A4
#1

Looks neat.

http://www.summitracing.com/search/Brand/NGK-Spark-Plugs/Product-Line/NGK-Powerdex-AFX-Air-Fuel-Monitors/?autoview=SKU&banner=Social1207007

#2

If I was to do something like that I would probably use what these guys have on offer http://audirevolution.net/forum/index.php?topic=823.0

#3

Yea, but that a lot of stuf to build a monitoring box.

Its worth it if I was going to do MODs on my own and clean the engine 02 line up a lot.

Problem is on how to impliment it into the ECU.