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m4a1mustang · 12-21-2012, 10:52 PM

Some people pack steel wool in the O2 bungs to filter the exhaust gasses and trick the sensors. The defoulers just back the O2 sensor farther out of the exhaust stream for a similar effect.

The latter is probably better for longevity. I'd imagine the steel wool would rust away after a while.

12-21-2012, 10:52 PM	#5844 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	Some people pack steel wool in the O2 bungs to filter the exhaust gasses and trick the sensors. The defoulers just back the O2 sensor farther out of the exhaust stream for a similar effect. The latter is probably better for longevity. I'd imagine the steel wool would rust away after a while. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!