# Well, the jokes on us -sort of- Blinker fluid

**URL:** <https://community.cartalk.com/t/well-the-jokes-on-us-sort-of-blinker-fluid/190052>\
**Category:** General Discussion\
**Created:** [April 11, 2023, 9:21pm UTC](https://community.cartalk.com/t/well-the-jokes-on-us-sort-of-blinker-fluid/190052 "2023-04-11T21:21:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\
**Post date:** [April 11, 2023, 9:21pm UTC](https://community.cartalk.com/t/well-the-jokes-on-us-sort-of-blinker-fluid/190052/1 "2023-04-11T21:21:26Z")

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[1 Car Actually Has Blinker Fluid (msn.com)](https://www.msn.com/en-us/autos/other/1-car-actually-has-blinker-fluid/ar-AA19Is7Y?ocid=msedgdhphdr&cvid=d3ef7c1329704634841b0f1aa7dff1cc&ei=18)

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**Author:** ![davesmopar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/davesmopar/32/41750_2.png) [@davesmopar](https://community.cartalk.com/u/davesmopar)\
**Post date:** [April 11, 2023, 10:09pm UTC](https://community.cartalk.com/t/well-the-jokes-on-us-sort-of-blinker-fluid/190052/2 "2023-04-11T22:09:23Z")

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I had to tell a customer that his muffler bearing was bad and making the rattling noise he was hearing… I took him out to the car cause I was not about to say that in front of other people…

BMW active muffler I think it is called, Napa shows the muffler list price at about $2400.00, special order…

Think of the muffler as having two exhaust tips coming out. at the inside end of one of the tips is a butterfly valve that opens and closes (like a drive by wire throttle body) to increase backpressure at idle and under light throttle. I believe one of the benefits is that it improves low end torque. If you’re right behind one at a traffic light, you can see it in action.

On my customers BMW the bearing had blown out and the flap was just flopping around inside making the rattling noise…

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**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\
**Post date:** [April 11, 2023, 10:56pm UTC](https://community.cartalk.com/t/well-the-jokes-on-us-sort-of-blinker-fluid/190052/3 "2023-04-11T22:56:42Z")

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I have it on my scat pack challenger. they call it active exhaust. when I start my vehicle on a cold start it is fully open. then it must shut a bit and quiets down a little as it warms. in sport mode it stays open more. and in track mode it will stay fully open. even partially shut it has a nice rumble.