# What The F........?

**URL:** <https://community.cartalk.com/t/what-the-f/190207>\
**Category:** Maintenance/Repairs\
**Created:** [April 21, 2023, 11:33pm UTC](https://community.cartalk.com/t/what-the-f/190207 "2023-04-21T23:33:31Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![jmcarc](https://avatars.discourse-cdn.com/v4/letter/j/278dde/32.png) [@jmcarc](https://community.cartalk.com/u/jmcarc)\
**Post date:** [April 25, 2023, 5:57pm UTC](https://community.cartalk.com/t/what-the-f/190207/22 "2023-04-25T17:57:37Z")

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I think those loops act like a stress relief to prevent cracks due to thermal expansion.

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [April 25, 2023, 6:04pm UTC](https://community.cartalk.com/t/what-the-f/190207/23 "2023-04-25T18:04:53Z")

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The link above says they do two things - modify the sound and reduce or eliminate the need for mufflers. Those make sense, unlike stress relief. Or was that a joke?

Loops are used in many industrial pipes where stress relief is needed.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [April 25, 2023, 6:10pm UTC](https://community.cartalk.com/t/what-the-f/190207/24 "2023-04-25T18:10:54Z")

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> [@jmcarc](#):
>
> I think those loops act like a stress relief

Where is the stress coming from? The weight of the exhaust tips? The whole back end of the system floats.

I don’t think stress is the issue.

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**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\
**Post date:** [May 5, 2023, 5:33pm UTC](https://community.cartalk.com/t/what-the-f/190207/25 "2023-05-05T17:33:56Z")

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We did a PDQ Bach choral piece in high school: The Queen to Me a Royal Pain Doth Give.

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