Or, you can do what I did and just get rid of the Y pipe and get a dual in/dual out muffler. Looks, sounds and works great!
That's actually what I am doing, I'm replacing my y pipe with a dual in/single out muffler
Looks like the idea is move the orginal sensor out farther so it runs cooler.
I'm assuming they work on a temperature differential if thats the case.
Could a guy plug the hole and attach the sensor right to the outside of the pipe.
I wonder if a guy could weld a stand-off reciever to the pipe and screw the sensor into it.
I'm pretty sure the way they work is they take a reading outside the pipe and inside the pipe and compare oxygen content (have no idea exactly HOW) and the way this trick works is by spacing the sensor out of the exhaust stream it somehow keeps it within it's range to not throw a code/CEL. Some people also pack steel wool in the spacers.
I've heard of the electronic resistor simulator trick too.
Supposedly computers are getting more difficult to "trick". So we'll see how it goes... It worked on my s10 like a charm though.