Magnaflow 12599 5x11 Oval Dual/Dual 3 in. Straight-Through Stainless Universal

Vehicle Fitment

• Universal fit - compatible with any vehicle or custom exhaust application requiring a 3 in. dual inlet / 3 in. dual outlet muffler with a 5 x 11 in. oval body profile
• Suitable for cars, trucks, SUVs, and custom builds where body clearance accommodates a 5 x 11 x 22 in. oval muffler
• 5.75 in. center-to-center spacing on inlets and outlets - verify this matches your exhaust pipe layout before ordering

Fitment Notes

• Universal muffler - professional installation or custom fabrication required; no direct bolt-on fitment for any specific vehicle
• Bi-directional design - can be installed in any orientation without flow restriction
• Inlet/outlet pipe connections require welding or use of compatible clamps (not included)
• Verify available clearance for the 5 x 11 x 22 in. body and 28 in. overall length before ordering

Features

• Tru-X straight-through perforated stainless steel core - dual-flow X-design for balanced, unrestricted exhaust flow
• Two-stage acoustic packing: stainless steel mesh wrap and acoustical fiber fill for a smooth, deep exhaust tone
• Bi-directional / reversible installation - fits any orientation without affecting performance
• 5 x 11 in. oval body minimizes ground clearance loss while maximizing internal muffler volume
• Satin finish stainless steel exterior for a clean, understated appearance
• 100% stainless steel construction - corrosion resistant for long-term durability
• CNC precision robotic manufacturing and lap-joint welding at all contact points
• Made in the USA - backed by Magnaflow's limited lifetime warranty

Specifications

• Part Number: 12599
• Muffler Type: Straight-Through, Tru-X Perforated Core
• Body Shape: Oval
• Body Dimensions: 5 in. x 11 in. x 22 in. (H x W x L)
• Overall Length: 28 in.
• Inlet Diameter: 3 in. (dual)
• Outlet Diameter: 3 in. (dual)
• Inlet/Outlet Center-to-Center Spacing: 5.75 in.
• Inlet/Outlet Configuration: Dual In / Dual Out
• Material: 409 Stainless Steel
• Finish: Satin (natural stainless)
• Fit Type: Universal
• Orientation: Bi-directional (reversible)
• Country of Origin: USA
• Quantity: Sold individually

Included Components

• 1x Magnaflow 12599 Universal Oval Muffler
• Note: Clamps, hangers, and piping are not included - sold separately as needed for custom installation

Product Description

The Magnaflow 12599 is a universal 5 x 11 in. oval straight-through performance muffler with a dual 3 in. inlet and dual 3 in. outlet configuration, purpose-built for custom exhaust builds, crossover/X-pipe setups, and dual exhaust systems that need a compact oval body with full 3 in. flow capacity. At the core of the 12599 is Magnaflow's Tru-X perforated stainless steel design - a dual-flow X-shaped internal architecture that balances exhaust flow across both cylinder banks for a smooth, deep tone and improved exhaust evacuation. The bi-directional design means it installs in any orientation without restriction, giving fabricators full flexibility in routing.

The two-stage acoustic packing - stainless mesh wrap plus acoustical fiber fill packed tightly around the perforated core - delivers Magnaflow's signature smooth, deep exhaust note without drone or resonance degradation over time. The 5 x 11 x 22 in. oval body keeps the overall footprint manageable under most platforms while providing ample internal volume. Built in the USA from corrosion-resistant 409 stainless steel with CNC-precision lap-joint welds, the 12599 is backed by Magnaflow's limited lifetime warranty.