Installed the WB last night. Works well, big display, CHEAP, came in at $250 with sensor (had to build it myself, God I love a good challenge). I eliminated welding a extra bung on by eliminating the rear o2 sensor and doubling up the siginal to the front. No falt codes so I assume all is well. What I need now is to look at some fuel maps to figure out where to start. If you can post Tech 2/3 or the MBSC charts, that would be a big help cuz I have the RC 440's also. Thanks, Dan Tobie