Flowmaster 50 Series HD 3.5-Inch Offset Inlet/Outlet Muffler - 953558

Specifications

• Brand: Flowmaster
• Part Number: 953558
• Series: 50 Series HD
• Product Type: Muffler
• Inlet: 3.5 in Offset Inlet
• Outlet: 3.5 in Offset Outlet
• Body Dimensions: 18 in L x 10 in W x 5 in H
• Body Shape: Oval
• Overall Length: 23 in
• Material: Steel
• Finish: Black Paint
• Sound Level: Moderate
• Fitment: Universal
• UPC: 700042017799

About the Flowmaster 50 Series HD

Flowmaster’s 50 Series HD is designed for heavy-duty trucks and large-displacement engines that need increased exhaust capacity while keeping the sound appropriate for regular street use. Flowmaster specifically recommends the series for applications such as Dodge Ram Hemi trucks, large-displacement gasoline engines, and diesel pickups. The 50 Series HD is rated with a moderate exterior sound level and mild interior resonance, giving the vehicle a deeper performance tone without the constant cabin presence associated with more aggressive chambered mufflers. Flowmaster also lists improved horsepower, torque, and engine efficiency among the intended benefits, making the series a practical option when upgrading a restrictive factory exhaust or building a custom truck system. The larger case provides the internal volume needed to control sound from high-output engines, while center, offset, and dual-outlet configurations give fabricators flexibility when routing larger tubing. Depending on the part number, construction may be aluminized steel or stainless steel. The 50 Series HD is not intended to be the loudest Flowmaster muffler; its role is to balance flow capacity, durability, and a noticeable but manageable performance sound for vehicles that work, tow, commute, or travel long distances. For a powerful truck or large-engine street application, it provides a heavy-duty Flowmaster solution that remains comfortable enough for everyday use.