Go get an AEM wideband O2 gage - it'll make your tuning a lot easier - instead of guessing - you will have real data to work with.

If your running dual exhaust get an extra bung do you can try the sensor in each pipe.

At WOT you should be aiming for 12.6 to 12.8:1 AFR.


51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them