MBRP UA2007 Aluminized Steel Exhaust Adapter, 3.5" ID to 4" OD, 7"L

Compatible Applications

• Universal - commonly used on diesel pickups and custom exhaust builds where a 3.5" connection must transition to 4", including MBRP 4" and 5" hardware

Fitment Notes

• 3.5" inside diameter expanding to 4.0" outside diameter
• 7.0" total adapter length
• Verify pipe end type (slip vs. butt) and available length in your system before ordering
• Clamps sold separately - reuse existing hardware or select appropriate 3.5" and 4" clamps
• Can be welded or clamped depending on setup and preference
• If T409 stainless is needed in this size range, MBRP's UA1007 is the stainless equivalent

Features

• Lets fabricators and installers change exhaust pipe diameter, simplifying the addition of an aftermarket exhaust system or custom fabrication work
• 100% aluminized steel construction offers solid corrosion resistance and long-term durability
• Universal fit connects to MBRP's 4" and 5" exhaust hardware regardless of the existing system's original size
• Handy reducer/expander for mixing exhaust components sourced from different systems
• Full bolt-on design compatible with clear, straightforward installation using minimal tools
• Backed by MBRP's warranty coverage on aluminized steel components

Specifications

• Type: Universal Exhaust Pipe Adapter
• Inside Diameter: 3.5"
• Outside Diameter: 4.0"
• Length: 7.0"
• Material: Aluminized Steel

Included Components

• 1x Exhaust Pipe Adapter

Product Description

The MBRP UA2007 is a universal aluminized steel adapter built to transition between 3.5" and 4" exhaust plumbing, a common need on diesel pickups and custom exhaust builds where components from different systems need to connect. One end is sized for 3.5" tubing and the other for 4", making it a straightforward reducer/expander rather than a custom-fabricated solution.

Aluminized steel construction keeps this adapter budget-friendly while still offering solid corrosion resistance for daily-driven trucks and project builds. It can be welded or clamped into place depending on your setup - just confirm your pipe end types (slip vs. butt) and available install length beforehand, and note that clamps are sold separately. For anyone needing a stainless steel version in this same size range, MBRP's UA1007 covers the same transition in T409 stainless.