Question about Downpipe
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Junior Member
Joined: Sep 2021
Posts: 36
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2011 C63 (Summer toy) 2018 C43, 2023 Audi SQ5 ( wifes car but sometimes allowed to drive it)
Question about Downpipe
Good evening , I have a question about Downpipes or whatever you want to call them on a NA car
Armytrix sell a Race high flow down pipe and I think there are a few more that do also
Would i see any benefit (worth while HP gains )on removing the stocks and replacing them with something like this.
Thank you
Armytrix sell a Race high flow down pipe and I think there are a few more that do also
Would i see any benefit (worth while HP gains )on removing the stocks and replacing them with something like this.
Thank you
Thread Starter
Junior Member
Joined: Sep 2021
Posts: 36
Likes: 9
2011 C63 (Summer toy) 2018 C43, 2023 Audi SQ5 ( wifes car but sometimes allowed to drive it)
These are not long tube headers these are the ones I'm talking about , I had a set of long tube headers ended up selling them
https://www.armytrixusa.com/armytrix...151461512.html
https://www.armytrixusa.com/armytrix...151461512.html
MBWorld Fanatic!
Joined: Dec 2005
Posts: 4,059
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From: NJ
2009 SL63 AMG
"Down pipes" are usually thought of on turbocharged cars, but in this case those are just the sections of the exhaust that come after the exhaust manifolds / headers.
Factory cats are not a huge bottleneck here. The factory log-style exhaust manifolds, however, are.
For me, there are better things to spend the $1K (plus install) on.
Factory cats are not a huge bottleneck here. The factory log-style exhaust manifolds, however, are.
For me, there are better things to spend the $1K (plus install) on.
Senior Member
Joined: Jan 2018
Posts: 415
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From: Whitehouse Station, NJ
2012 C63 P31 Sedan
They do offer a catted version (200 cpi core) as well. I like the idea of that, especially if it could pass the OBD2 catalyst efficiency check. Unfortunately, they are a bit pricy (~$2K) and I haven't heard from anyone if they are effective enough to pass plug in emissions testing.
At least they look to be reasonably DIY friendly though.
At least they look to be reasonably DIY friendly though.
Member
Joined: Jun 2020
Posts: 208
Likes: 47
AMG C63
They do offer a catted version (200 cpi core) as well. I like the idea of that, especially if it could pass the OBD2 catalyst efficiency check. Unfortunately, they are a bit pricy (~$2K) and I haven't heard from anyone if they are effective enough to pass plug in emissions testing.
At least they look to be reasonably DIY friendly though.
At least they look to be reasonably DIY friendly though.
Sort of a position im in at the moment between just doing a full decatted/terrible emissions vs trying to play the game with Johnny Law until historic plates are available.
Plenty of catted LT's etc but I'm curious if you HAVE to have the resonator in order to pass emissions.
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From: New Hampshire
ML 63 AMG
Originally Posted by GarlicBread;[url=tel:8902777
8902777[/url]]Do any aftermarket setups actually pass currently?
Sort of a position im in at the moment between just doing a full decatted/terrible emissions vs trying to play the game with Johnny Law until historic plates are available.
Plenty of catted LT's etc but I'm curious if you HAVE to have the resonator in order to pass emissions.
Sort of a position im in at the moment between just doing a full decatted/terrible emissions vs trying to play the game with Johnny Law until historic plates are available.
Plenty of catted LT's etc but I'm curious if you HAVE to have the resonator in order to pass emissions.
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Junior Member
Joined: Sep 2017
Posts: 33
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2013 C63 AMG PP Coupe
Do any aftermarket setups actually pass currently?
Sort of a position im in at the moment between just doing a full decatted/terrible emissions vs trying to play the game with Johnny Law until historic plates are available.
Plenty of catted LT's etc but I'm curious if you HAVE to have the resonator in order to pass emissions.
Sort of a position im in at the moment between just doing a full decatted/terrible emissions vs trying to play the game with Johnny Law until historic plates are available.
Plenty of catted LT's etc but I'm curious if you HAVE to have the resonator in order to pass emissions.
Oh and prior to the long tubes, I removed the one set of cats and the resonator, that doesn't affect obd emissions test at all.
Senior Member
Joined: Apr 2022
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W211 E63 AMG
"downpipes" for our cars reuse the factory shorty headers which are the biggest restriction. if you want noise this is a good solution but is you want power true long tubes with collectors under the car are the only way.
