MBRP UA2003 3-1/2" ID TO 5" OD ALUMINIZED EXHAUST ADAPTER (UNIVERSAL)

MBRP UA2003 is a universal aluminized-steel exhaust adapter that transitions from 3.5" ID to 5" OD, ideal for custom builds, repairs, and size changes on diesel truck exhaust systems.

• Material: Aluminized steel
• Size: 3.5" Inner Diameter (ID) to 5" Outer Diameter (OD)
• Use case: Reducer/expander for adapting mixed pipe sizes
• Universal fit for custom fabrication

Fitment Details

Universal—works for custom exhaust fabrication across light-duty and heavy-duty diesel platforms (Cummins, Duramax, Power Stroke) where a 3.5" ID to 5" OD transition is required.

Cross-Reference / Alternatives (MBRP only)

• MBRP UA2001 – 4" ID to 5" OD (Aluminized)
• MBRP UA2004 – 4" ID to 5" ID (Aluminized)
• MBRP UA2005 – 3.5" OD to 5" ID (Aluminized)
• MBRP UA2007 – 3.5" OD to 4" OD (Aluminized)
• MBRP UA1007 – 3.5" ID to 4" OD (Stainless)
• MBRP UA9001 – 4" ID to 5" OD (Stainless)
• MBRP UA9004 – 4" ID to 5" ID (Stainless)

FAQ

It is a universal adapter for fabrication. Verify your pipe sizes (3.5" ID to 5" OD) and overall length/space before purchase.

Aluminized steel offers solid value and durability, but stainless is recommended for harsh, high-salt environments. See stainless options in the Cross-Reference list above.

Match clamp sizes to your mating pipe diameters (3.5" and 5"). Use quality lap-joint or band clamps and verify overlap for a leak-free seal.

Yes—aluminized steel can be welded by a qualified fabricator. Remove coating at weld zones for best results.