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  #1  
Old 03-19-2005, 12:50 PM
four50sel's Avatar
'78 450SEL
 
Join Date: Dec 2004
Location: Atlanta, GA
Posts: 55
'74 Exhaust on '78 450SEL?

My W116 will need a new exhaust soon (as far as I am concerned). My question is whether or not an exhaust system for a 1974 model will fit on a 1978 with no unusual modifications?

Is there anything in particular I need to be aware of in the conversion.

As my car is at least 25 years old, it is not required to get an emissions inspection. In other words... "Bye-bye cats!"

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1978 450SEL (Pearl white, bamboo interior, 97k)
1959 Impala (2 dr. Hardtop, red, white int., 283 V8, 45k)
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Last edited by four50sel; 03-19-2005 at 02:05 PM.
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Old 03-19-2005, 05:25 PM
Tomguy's Avatar
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Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,407
I believe the exhaust manifolds are different on the 74 and 78. The 78 has the split-manifold design with the outlet on the rear, while the 74 has the same style as the 108/109's - single manifold on the driver's with the outlet in the center, and dual manifolds on the passenger's side with the header pipe joining them together.

Basically, you'll need the entire system - the manifolds (3 pieces), engine pipes (two pieces), and then the resonator and muffler (two pieces).
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Old 03-20-2005, 10:03 AM
four50sel's Avatar
'78 450SEL
 
Join Date: Dec 2004
Location: Atlanta, GA
Posts: 55
Timevalve has a stainless exhaust system for the Euro models. Would this work?

http://www.timevalve.com/cat/euro/p20c.html
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1978 450SEL (Pearl white, bamboo interior, 97k)
1959 Impala (2 dr. Hardtop, red, white int., 283 V8, 45k)
2003 Tiburon GT V6 (Ultra Sports Pkg. 3, red, blk int., 13k)
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  #4  
Old 03-20-2005, 12:48 PM
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Join Date: Nov 2003
Posts: 111
Tomguy is correct. Also, just wanted to mention to make sure
you avoid the '75 and possibly '76 exhaust manifolds that had little
catalytic convertors mounted directly under them

I cracked both exhaust manifolds on my '74 once, and
I believe one of the replacements was from a 77 or 78.
It bolted right up to the existing system.
Get the exact manifold, look at it and you can determine
whether that is all you need. If you can get the header pipe
with it (e.g. if you are pulling them out of a junker and can cut the
pipe with a muffler pipe cutting tool) do it.
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  #5  
Old 03-20-2005, 06:13 PM
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Join Date: Jan 2004
Location: Upstate SC
Posts: 1,114
I've got the maifolds from my '79 450SEL parts car, they are a three piece design with stainless bellows joining the sections.

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