Walker Exhaust 16686 catalytic converter for the 2006-2008 Cadillac DTS V8 4.6L and other vehicles bolts into the exhaust system to treat engine exhaust before it leaves the tailpipe. It is made for OBDII vehicles, 1996 and newer, and is not legal for sale or use in California or Colorado.
- Walker Ultra EPA line, built to comply with EPA standards
- High load of precious metals and a high-technology washcoat to reduce tailpipe emissions
- Stainless steel body with a ceramic substrate
- Thick flanges, hangers and brackets for strength and durability
- Aluminized heat shields where the original was equipped with them, to protect the undercarriage from converter heat
Quick facts
- Part: Walker Exhaust 16686 catalytic converter
- Fits: 2006-2008 Cadillac DTS V8 4.6L and other vehicles
- Material: Stainless steel body, ceramic substrate
- Condition: New
A leaking exhaust pipe, a failing oxygen sensor or an engine misfire can set the same emissions codes as a worn converter, so find the cause before buying. A catalyst-related check engine light, a rattle inside the converter or a failed emissions test can mean the converter needs replacing.
Fits
This is a catalytic converter for the 2006-2008 Cadillac DTS V8 4.6L, the 2000-2005 Cadillac DeVille V8 4.6L and the 1998-2001 Cadillac Seville V8 4.6L.
Specifications
Fit and size
- Quantity per vehicle: 1
- Inlet: 4 bolt welded flange
- Outlet: pipe connection, 2.625 in outside diameter
- Overall length: 20 in
- Body: small oval, 6.1 in wide, 3.41 in high
Build and materials
- Body material: stainless steel
- Substrate material: ceramic
- Emissions: EPA compliant, CARB certified: No
- Condition: New
- Walker warranty: 25,000 miles/40,000 km on emissions, 5 years/50,000 miles/80,000 km on structural integrity
In the box
One catalytic converter. This listing holds one, and the vehicle takes one.
Installation notes
- Bolt-on direct-fit replacement with factory-style hangers, brackets and routings.
- No specialized fabrication or welding is needed.
Interchange: 21-411 · 21-412 · 21-482
645979 · 645999 · 940027 · 940840 · 944840 · 949027 · 9027 · 9035 · 50410 · 15921941 · 15921942 · 25748927
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
645979, 645999, 940027, 940840, 944840, 949027, 9027, 9035, 50410, 15921941, 15921942, 25748927, 21-411, 21-412, 21-482
Frequently Asked Questions
Is the Walker Exhaust catalytic converter EPA compliant?
Yes. Walker Exhaust 16686 is built to comply with EPA standards for OBDII vehicles, 1996 and newer. It is not legal for sale or use in California or Colorado.
Will this catalytic converter fit a 2006 Cadillac DTS V8 4.6L from the 2006-2008 run?
Yes. Walker Exhaust 16686 is a direct-fit converter for the 2006-2008 Cadillac DTS V8 4.6L, and the vehicle takes one.
What is the outlet diameter on this catalytic converter?
The outlet is a pipe connection with a 2.625 in outside diameter. The inlet is a 4 bolt welded flange.
Does this converter need welding to install?
No. It is a direct-fit, bolt-on design that needs no specialized fabrication or welding.
What is this converter's body made of?
The body is stainless steel and the substrate inside is ceramic.
