Originally Posted by Tgresch
im saying the o2 behind the cat is gone everything cat forward electronic wise is going back in and if im feeling rely anxious and rich i may replace some things up there too
Oh, okay. Not a problem. I thought you were saying you weren't using ANY O2 sensors.
The free-flowing exhaust will only slightly delay the warm-up time for the O2 sensor. We are talking a couple minutes. No big deal. Sorta like the difference between startup in the summer vs startup in the winter. Naturally, the closer the sensor is to the total exhaust output (like where the factory joins the two before the cat), the better. I wouldn't put much stake in any performance info from the dealer. I once had a dealer state that I couldn't even change to a free-flowing muffler because it'd likely throw the computer off and it'd be illegal, and I'd get in trouble with the Feds.
Yeah.... Right..... Stick to sellin' cars Chief.