Do I need a bung welded into my downpipe to get an air fuel reading when at the dyno? I have a straight through exhaust; DP, no cat, straight through Magnaflow resonator and muffler. Can i take out my secondary o2 sensor just for the runs and place the probe in there?

 

Email me I know where to get some local....

 

if you're using the dynojet wideband, you need a 18mm spark plug non fouler. Pick up two. Use one, and drill out the bottom. Weld that one into your downpipe. The second you will use as a cap for when you are not using the wideband.