What is this?

Please could someone tell me what this is and what is it used for?

Looking at getting a new exhaust and have noticed that some do not come with this sensor

It's a silly valve that shuts off the offside tailpipe at low revs.

It's to do with passing some noise test or other.

So, at low revs you only use one tailpipe.:shrug:

You can do without it. You can also disconnect the pipe to it, and you just need to block the pipe and alls good!
Most aftermarket exhausts don't have it!

:woohoo:
My son posted the question thinking this device had something to do with lambda!
So pleased to know that this can be discarded along with the back box and I can get the motor back on the road. (No mention of it in the workshop manual - although that's an easy read - not!!!!!
My day is now made - thanks David

TFTiger wrote: :woohoo:
My son posted the question thinking this device had something to do with lambda!
So pleased to know that this can be discarded along with the back box and I can get the motor back on the road. (No mention of it in the workshop manual - although that's an easy read - not!!!!!
My day is now made - thanks David

:thumbsup: