Downpipes only vs LTH
Thread Starter
Senior Member
Joined: Mar 2007
Posts: 471
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CLK63 AMG Black Series
Downpipes only vs LTH
Im considering a set of Armytrix (or similar) downpipes which removes primary/secondary cats but retains stock headers and resonator. Does anyone know how much quieter this is compared to a full long tube header setup?
I would assume removal of both cats should be pretty loud but will the stock header quiet it down?
I would assume removal of both cats should be pretty loud but will the stock header quiet it down?
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Joined: Jun 2009
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2010 C63 AMG
Im considering a set of Armytrix (or similar) downpipes which removes primary/secondary cats but retains stock headers and resonator. Does anyone know how much quieter this is compared to a full long tube header setup?
I would assume removal of both cats should be pretty loud but will the stock header quiet it down?
I would assume removal of both cats should be pretty loud but will the stock header quiet it down?
Member
Joined: Apr 2022
Posts: 188
Likes: 41
2012 C63 P31 and 2011 E550 Luxury
Im considering a set of Armytrix (or similar) downpipes which removes primary/secondary cats but retains stock headers and resonator. Does anyone know how much quieter this is compared to a full long tube header setup?
I would assume removal of both cats should be pretty loud but will the stock header quiet it down?
I would assume removal of both cats should be pretty loud but will the stock header quiet it down?
Thread Starter
Senior Member
Joined: Mar 2007
Posts: 471
Likes: 19
CLK63 AMG Black Series
Hey so i was in exactly the same boat as you and played around with a few things over the years. I had the full Armytrix exhuast downpipes, resonator and valvetronic mufflers connected straight to my stock headers and it was loud. However with the valvetronic mufflers it did quiet it down quite a bit when i had the valves closed. I then removed the entire Armytrix exhuast and installed full length ARH with a custom 3" exhuast and to my surprise it wasn't much louder, i would say it is around 5-10% louder. The valvetronic muffler is what quieted it up the most. By the way i have my entire Armytrix trix exhaust with the valve tronic sitting in my storage locker and i would let it go for a killer price if you really want it.
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12 C63BS Magno Alanite Grey, 25 X5 Msport, 08 BMW E93, Ducati Hyper 698
Here is how I would characterize the volume having tried all these things over the years.
Remove secondary cats, Mikes Power Pipe H pipe - 15% louder
remove secondary cats, Mikes Power Pipe straight - 20-25% louder
Armytrix downpipe with 200 cell race cats - 50-60% louder
no cats - full headers or cat less downpipes - 100% louder
this is all with factory back half resonator and mufflers.
Remove secondary cats, Mikes Power Pipe H pipe - 15% louder
remove secondary cats, Mikes Power Pipe straight - 20-25% louder
Armytrix downpipe with 200 cell race cats - 50-60% louder
no cats - full headers or cat less downpipes - 100% louder
this is all with factory back half resonator and mufflers.
Junior Member
Joined: Oct 2024
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C63 507 Coupe
I'm interested in this, as well. I don't like the idea of chopping off the secondary cats from the OEM system, so the Armytrix 200 catted down pipes seem like a good solution. With the cats being less restrictive, would I have to have the car tuned to avoid throwing a lambda code?
Member
Joined: Apr 2022
Posts: 188
Likes: 41
2012 C63 P31 and 2011 E550 Luxury
I'm interested in this, as well. I don't like the idea of chopping off the secondary cats from the OEM system, so the Armytrix 200 catted down pipes seem like a good solution. With the cats being less restrictive, would I have to have the car tuned to avoid throwing a lambda code?
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MBWorld Fanatic!
Joined: Aug 2016
Posts: 2,405
Likes: 724
12 C63BS Magno Alanite Grey, 25 X5 Msport, 08 BMW E93, Ducati Hyper 698
I'm interested in this, as well. I don't like the idea of chopping off the secondary cats from the OEM system, so the Armytrix 200 catted down pipes seem like a good solution. With the cats being less restrictive, would I have to have the car tuned to avoid throwing a lambda code?
Last edited by roadkillrob; Feb 7, 2025 at 09:25 PM.
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Junior Member
Joined: Oct 2024
Posts: 33
Likes: 10
C63 507 Coupe
Shout out to @roadkillrob for trying to hook a brother up with some catted downpipes. Turns out the shipping would be extortionate, so it just makes sense to buy a new set from Armytrix.
I've seen plenty of clips on YT of the Armytrix catless downpipes with stock resonator & mufflers, but does anyone have the Armytrix 200 cell catted downpipes installed on their car? Better yet, anyone have a sound clip? They don't seem to be a poplar option. Based on Rob's sound level breakdown above, I'm looking to get somewhere in between stock and HOA complaint.
I've seen plenty of clips on YT of the Armytrix catless downpipes with stock resonator & mufflers, but does anyone have the Armytrix 200 cell catted downpipes installed on their car? Better yet, anyone have a sound clip? They don't seem to be a poplar option. Based on Rob's sound level breakdown above, I'm looking to get somewhere in between stock and HOA complaint.
