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Exhaust› Mufflers and Resonators

Flowmaster

50 Series Big Block Chambered Muffler 50 Big Block 3.50 Offset In 3.50 Offset Out Mild Sound Flowmaster

$327.95 $290.95 Save $37.00

SKU: F00L 53553

In Stock
In Stock
Ships by Aug 2
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Easy — 1–2 hours

Description

Part #: 53553

The 50 Series Big Block muffler is made for more than just big cubic inch engine applications. Its large case size with internal tuning chamber provides mileage and power gains along with maximum sound control for a quiet interior tone, even under heavy loads. Well suited to heavy duty vehicles such as full size trucks, SUV's, RVs, and tow vehicles. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.

Features:

  • Durable Fully Welded 16ga Aluminized Steel
  • Improved Horsepower, Torque and Engine Efficiency
  • 3 Year Limited Warranty
  • Recommended for SUV/trucks/motorhomes/tow vehicles
  • Stock to Mild Exterior Exhaust Tone
  • Minimal interior resonance
  • Reduced Interior Resonance
  • Mild to stock exterior exhaust tone
  • Recommended For SUV/Trucks/Motorhomes/Tow Vehicles
  • Improved HP/TQ and Potential Mileage Improvement
  • Race Proven Patented Delta Flow (R) Technology
  • Premium Flowmaster Quality

50 Series (TM) Big Block Muffler | 3.5 in. Offset Inlet/Opposite Side Offset Outlet | Case Dimensions 5 in. x 12 in. x 22 in. | 28 in. Overall Length | Aluminized Steel

MIA's Description

Introducing the quietest muffler in Flowmaster’s catalog—the 50 Series Big Block. Featuring a large overall size and extra-large resonance tuning chamber, the Flowmaster 50 Series Big Block Muffler produces a mild interior and exterior tone at all RPM levels, ideal for large, heavy vehicles like trucks, SUVs, and RVs. The 50 Series Big Block Muffler also works excellent in towing applications, quieting the typical drone of a large engine under load. While producing a quiet exhaust tone, the 50 Series Big Block Muffler doesn’t smother the engine like a factory unit. Instead, the Flowmaster flows significantly more air than a factory exhaust, producing mild horsepower and torque gains. Like all of Flowmaster’s exhaust products, the 50 Series Big Block Muffler is built to last. Aluminized steel construction helps to keep corrosion at bay, while a fully MIG-welded chamber ensures maximum durability. For exceptional performance at close-to-stock noise levels, consider a Flowmaster 50 Series Big Block Muffler.

Fitment

Fitment Guaranteed

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Specifications

BrandFlowmaster
Part NumberF00L 53553

Videos

2003 Silverado SS Flowmaster 50 Series Big Block exhaust before and after

2003 Silverado SS Flowmaster 50 Series Big Block exhaust before and after
We Installed Our BIGGEST Muffler!

We Installed Our BIGGEST Muffler!

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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