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Stock catback pipe diameter at Cat?

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Old Jan 14, 2016 | 05:20 PM
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yr6
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Stock catback pipe diameter at Cat?
Just wondering what diameter the stock catback piping is where it meets the stock cat. Is it 2" or 2.5"? I tried looking for this info and fell short.

thanks
Last edited by yr6; Jan 14, 2016 at 05:20 PM. Reason: added info
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Old Jan 14, 2016 | 07:04 PM
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i've posted this before, i think its 55mm? its not in inches, its a modern car
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Old Jan 14, 2016 | 07:15 PM
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Originally Posted by j9fd3s
i've posted this before, i think its 55mm? its not in inches, its a modern car
I was thinking on a turbo car it was closer to 2.5 inches or 64mm(2.5197). The n/a I thought were smaller. Maybe they are 55mm or 2.165"
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Old Jan 14, 2016 | 07:37 PM
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pipe size
The reason I ask is my exhaust is all stock. I've purchased the Bonez Turboflow system and was wondering when i instal it if the opening to the stock catback will be a restrictive spot in the system now.
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Old Jan 14, 2016 | 07:59 PM
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Originally Posted by yr6
The reason I ask is my exhaust is all stock. I've purchased the Bonez Turboflow system and was wondering when i instal it if the opening to the stock catback will be a restrictive spot in the system now.
I had the Bonez system on our S5 TII with the OEM factory cat back, fit is fine, no restriction, but with the OEM converter or Bonez cat no difference
in performance.
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Old Jan 14, 2016 | 08:06 PM
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pipe size
I'm not set on a big performance upgrade. I'd just like the rpms to pick up quicker and reduced turbo lag.
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Okay, been working on rotaries for a decade. I am just stumped.




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