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Question of C63s Downpipe Size

Old May 29, 2021 | 04:16 AM
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W205 C63S
Question of C63s Downpipe Size

HI Guys,

I've got curiosity regarding the Downpipe Sizing for our W205 C63s.
Most we have seen on the market of the DP they are size 3" which diameter are 76mm
but some only comes size 2.76" which diameter are 70mm
and some even larger than 3" (76mm), i am wondering are they really the bigger the better??

67mm Downpipe: [ Smallest ]
  • Soul

70mm Downpipe:
  • IPE
  • Supersprint
  • Armytrix
  • Stone
  • Match 5

76mm Downpipe:
  • FI
  • VRP
  • SSR
  • Weistec
  • ModalWorks

84mm Downpipe:
  • Mikes_Custom

89mm Downpipe: [ Largest ]
  • ZAC
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Old May 29, 2021 | 08:26 AM
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W205 C63
All downpipes on these cars have their widest opening near the turbo, which is about 3.5”. Some vendors advertise their downpipes as 3.5” because of this initial section of tube before transitioning back to 3”.

We mention this on our website as well. Overall, 3” seems to be appropriate for nearly all power levels ranging from OEM to aftermarket turbos.

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Old May 29, 2021 | 11:40 AM
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W205 C63S
Originally Posted by ModalWorks
All downpipes on these cars have their widest opening near the turbo, which is about 3.5”. Some vendors advertise their downpipes as 3.5” because of this initial section of tube before transitioning back to 3”.

We mention this on our website as well. Overall, 3” seems to be appropriate for nearly all power levels ranging from OEM to aftermarket turbos.
HI ModalWorks,

I've just found that from the ModalWorks website that you guys also with the size of 3.5"
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Old May 29, 2021 | 11:51 AM
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W205 C63S
Originally Posted by ModalWorks
All downpipes on these cars have their widest opening near the turbo, which is about 3.5”. Some vendors advertise their downpipes as 3.5” because of this initial section of tube before transitioning back to 3”.

We mention this on our website as well. Overall, 3” seems to be appropriate for nearly all power levels ranging from OEM to aftermarket turbos.
is this the initial section of tube ?



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Old Apr 23, 2023 | 07:38 PM
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GLC43 AMG
looking for downpipes for my GLC43
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Old Feb 10, 2024 | 07:09 AM
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W205 C63s Coupe
Sorry for waking up old thread but what size are stock downpipes? And will you be robbing performance with a 2.75 vs 3 on these cars with just stage 2?
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