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Old 01-28-2003, 11:40 PM
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Join Date: Nov 2002
Location: Tucson, AZ
Posts: 306
Question W126 V8 Dual Exhaust Upgrade Question

Can a 126 V8 be retrofitted with euro style dual exhaust without to much difficlulty. If so, with dual cats would it meet federal smog specs. Are the US and Euro exhast manifolds the same?

Thanks for your help, we have been discusing this topic in another forum but the EXPERTS are over here.

Again, thanks for any assistance.

'90 420 SEL

'90 420 SEL (sold)
'72 280 SEL 4.5
'98 ML320 (for sale)
'86 560SL
'05 Jeep Grand Cherokee Ltd (offroad in style)
'87 Chevy Blazer (AZ Pin Strips)
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Old 01-29-2003, 12:01 AM
Join Date: Jan 2000
Location: Indpls.,IN. USA
Posts: 84
The only V-8s that originally had dual exhaust were pre 86 models from outside the US. Those grey market cars had cast-iron manifolds that exited on either side of the trans. and there was plenty of room to fabricate cats. into the system.As far as being legal I doubt most states would allow modification fron the original configuration. If it only has to pass a sniff test then I'm sure a system could be made that would pass.
Starting with the 86 models the left manifold crossed over the trans except the SLs which crossed under the bellhsg. and merged into one large cat setup which became dual after the cat.
The best way would be to find AMG headers that were made by another co. Sebring? maybe and of course were big bucks. One more thought, the port shape on the 420-560 motors was offset and would match poorly with a 380-500 manifold. Good Luck!
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Old 01-29-2003, 01:33 AM
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Join Date: Nov 2001
Location: VA 20 miles west of D.C.
Posts: 245
I have a Euro grey market, my original exhaust did have two individual manifolds and dual all the way back, the cars were retrofitted near the trans, I later took the cats off and had the Euro downpipes, new cost $80 each, then my engine went bad, I put an American exhaust single, no cat or resonator is needed for Euro since mine is waived from all 50 state emissions
1994 Ford Taurus SHO
1999 Kawasaki Ninja ZX9R
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Old 01-29-2003, 11:29 AM
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Join Date: Oct 2002
Posts: 75

Reentech offers european stainless headers and down pipes and stainless mufflers, but the 3000.00 plus price tag for 25 hp gain does'nt seem worth it to me. Your model may or may not be available.


1989 420SEL 105575 miles
Pearl Black/Grey

1990 Chevrolet E-Cab C-1500
293,000 miles

1989 Olds Toranado Trofeo'
132,000 miles
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