Product Description
MBRP UA2004 4" ID TO 5" ID ALUMINIZED EXHAUST ADAPTER (UNIVERSAL) is a straight-through reducer/expander designed to connect 4" inner-diameter tubing to 5" inner-diameter exhaust sections in custom or service applications. Built from aluminized steel for dependable corrosion resistance and value, it’s an easy way to adapt mismatched pipe sizes on diesel trucks, stacks, or universal fabrication projects.
Fitment / Use Cases
- Universal fit: adapts 4" ID to 5" ID sections; suitable for most diesel truck exhausts and custom builds.
- Common scenarios: stepping a 4" mid-pipe to a 5" tail section, stack bases, or mating aftermarket components of different diameters.
- Installation: slip fit and clamp or weld as appropriate; verify end types (slip vs. butt) before install.
- Material: aluminized steel.
Cross-Reference / Alternatives (MBRP Only)
- MBRP UA2001 – 4" ID to 5" OD (Aluminized)
- MBRP UA2003 – 3.5" ID to 5" OD (Aluminized)
- MBRP UA2005 – 3.5" OD to 5" ID (Aluminized)
- MBRP UA2007 – 3.5" ID to 4" OD (Aluminized)
- MBRP UA9004 – 4" ID to 5" ID (Stainless)
- MBRP UA9001 – 4" ID to 5" OD (Stainless)
- MBRP UA1007 – 3.5" ID to 4" OD (Stainless)
Install Tips
- Deburr pipe ends and test-fit before final clamping or welding.
- Use appropriate torque on band clamps; re-check after heat cycles.
FAQ
Will this fit my truck?
Yes—UA2004 is a universal 4" ID to 5" ID adapter. Confirm your current pipe diameters and end types (slip vs. butt-joint) before ordering.
Is UA2004 stainless or aluminized?
UA2004 is aluminized steel. For stainless in the same size range, see UA9004.
Do I need clamps?
Clamps are sold separately. You may clamp or weld depending on your setup. Verify your preferred connection style.
What trucks is this commonly used on?
Popular for diesel pickups stepping from 4" sections to 5" sections (e.g., custom Cummins/Power Stroke/Duramax exhaust builds). Measure first to confirm.
