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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 07-08-2021, 11:13 AM   #1
ghostzfh
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Question pipe between muffler and resonator looks strange

The pipe between my muffler and resonator seems rusted on my 2016 FRS, but neither the muffler or the resonator seems to be rusting. This is strange considering that all three are connected, and that somehow the pipe in between these two things became selectively rusted.

Is this normal or is this a cause for concern? And if it's an issue, what caused it and what could I do about this?
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Old 07-08-2021, 12:16 PM   #2
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Likely different grade of stainless made from a different vender for Subie with possibly different post treatment process. Nothing to be concerned about, it will last another 20 years.
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Old 07-08-2021, 12:31 PM   #3
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Mine was all rusty as well.
Painted with black HT paint when I took apart for front pipe change.
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Old 07-08-2021, 12:46 PM   #4
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I just double checked, the stock rear muffler is aluminized mild steel. That is why the flange is so rusty at the joint. The mid pipe is going to pick up corrosion from heat cycling with debris stuck to it, and galvanic corrosion from being in contact with the muffler section.
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Old 07-08-2021, 01:08 PM   #5
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Quote:
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galvanic corrosion
*Something* always rusts
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Old 07-08-2021, 01:17 PM   #6
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Quote:
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*Something* always rusts
And stainless will corrode sooner if it is in contact with a ferrous metal(galvanic corrosion).
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Old 07-08-2021, 01:39 PM   #7
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Megan Racing has a replacement or you can get the remark one.

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Old 07-08-2021, 02:31 PM   #8
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Megan Racing has a replacement or you can get the remark one.

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Oooor you can wait until there’s a hole in it.
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Old 07-08-2021, 04:03 PM   #9
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And stainless will corrode sooner if it is in contact with a ferrous metal(galvanic corrosion).
galvanize this
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Old 07-08-2021, 06:02 PM   #10
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galvanize this
Just don't attach yourself to any dissimilar materials and you will be fine.
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Old 07-08-2021, 06:10 PM   #11
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Just don't attach yourself to any dissimilar materials and you will be fine.
lol...


you totally win
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Old 07-08-2021, 06:21 PM   #12
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Old 07-08-2021, 06:35 PM   #13
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.
10/10 many layers
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Old 07-08-2021, 09:50 PM   #14
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i think you need to spend more time driving your car and less time laying underneath it!
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