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Old 06-12-2020, 06:40 PM   #1
Lightened
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>> SOLD << OEM 2017 Stock Exhaust Manifold HEADER

>> SOLD <<

OEM 2017 Stock Exhaust Manifold Header

Approx. 20k miles - Catalytic converter appears like new


Last edited by Lightened; 09-07-2020 at 06:14 PM.
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Old 06-13-2020, 10:37 AM   #2
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So the 2017 header is different between the A/T and manual cars?
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Old 06-13-2020, 11:45 AM   #3
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Quote:
Originally Posted by mib911 View Post
So the 2017 header is different between the A/T and manual cars?

Correct.

The 2017-2020 manual header has slightly larger diameter primary and secondary runners.

The exit pipe diameter after the catalytic converter are all the same on 2013-2020 A/T and manual models.
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Old 06-13-2020, 12:04 PM   #4
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Originally Posted by Lightened View Post
The 2017-2020 manual header has slightly larger diameter primary and secondary runners.
The diameter change is 5% and 8% respectively. In fact, if you do the math, the actual area increase is more. In the range of 11% and 16.5% .
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Old 07-12-2020, 07:21 PM   #5
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Last edited by Lightened; 09-07-2020 at 06:14 PM.
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