exhaust manifolds - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 08-03-2014, 06:10 AM Thread Starter
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Date registered: Aug 2014
Vehicle: 1975 450 SEL
Location: Virginia
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exhaust manifolds

I have a 1975 450 SEL, and I believe this was the first year for catalytic converters attached below the exhaust headers. Is it possible to install 1974 headers w/ out the catalytic converters, or hollow out the existing converters, as the CC technology was very restrictive at the time
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post #2 of 5 (permalink) Old 08-03-2014, 11:48 AM
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yes , you can , also have to replace the header pipes i think .
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post #3 of 5 (permalink) Old 08-03-2014, 04:07 PM
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Date registered: Aug 2006
Vehicle: 1998 SL500, 2010 GLK 350, 1972 300SEL 4.5, 1971 280SL, 1970 300SEL 6.3
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I suggest you replace or core out. I saw 1975 116 body burned up because in this first year of the CCs being close to the exhaust manifolds they glow red hot.
This was many years ago and Mercedes paid for it.
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post #4 of 5 (permalink) Old 08-04-2014, 05:11 AM
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Date registered: Mar 2010
Vehicle: 1973 350SL 4 spd, 1970 250C 4 spd, 1979 280SL 4 spd, 1974 450SL
Location: Milton NC Home of VIR!
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I have a 73 350SL euro I am parting if you want those manifolds and exhaust. I have a rear muffler that is pretty much new...located in NC but run up to DC on a regular basis.


Al Taylor
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post #5 of 5 (permalink) Old 08-04-2014, 11:44 AM
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Date registered: Jan 2013
Vehicle: 90 350SDL, 98 S420, 97 SL500, 94 S420, past owner of W108/W112/W114/W123/W124/W126/W140 & W220 cars
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The cats being under the hood like that on the 75 model led to almost certain catastrophic failures of every piece of rubber under the hood on these models.

As soon as you open the hood on one, grab the closest piece of rubber fuel line (there are lots and lots of them!) or other rubber part and more often than not they will crumble in your hand.

I was looking for one of these some years back, and quickly learned to avoid the 1975 model year....

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