MagnaFlow 12251 Oval Straight-Through Performance Exhaust Muffler 2.25in Center In/Dual Out

The MagnaFlow 12251 is a 5" x 8" oval straight-through performance exhaust muffler featuring a 2.25" center inlet and dual 2.25" outlets with an 18" body length and 24" overall length. Engineered to deliver dyno-proven power gains and MagnaFlow's signature deep, resonating exhaust tone, this muffler is an ideal upgrade for custom exhaust builds and performance applications.

At the heart of the 12251 is a free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh with two-stage acoustic fiber fill packing. This internal architecture maintains exhaust velocity while generating a smooth, deep tone that does not degrade over time.

Key Features:

• Body Size: 5" x 8" oval, 18" body length, 24" overall length
• Inlet/Outlet: 2.25" center inlet / dual 2.25" outlets; 2.5" core size
• Construction: T-409 stainless steel body, end caps, and one-piece perforated core
• Finish: Satin stainless finish
• Design: Fully reversible and universal — installs in any orientation or configuration
• Acoustic Packing: Stainless steel mesh wrap with two-stage high-temperature acoustic fiber fill
• Welding: All joints overlapped 1/2" and fully welded for leak-free, distortion-resistant construction
• Origin: Proudly made in the USA
• Warranty: MagnaFlow limited lifetime construction warranty

The straight-through, single-piece core eliminates flow restrictions and reduces backpressure, helping improve exhaust gas evacuation and engine performance. The universal design allows custom muffler placement to meet the specific spacing and mechanical requirements of virtually any vehicle. Professional installation is recommended, and custom fabrication, cutting, and/or welding may be required.