MBRP® M1004S - Pro Series™ 409 SS Round Exhaust Muffler (4" Center ID, 4" Center OD, 30" Length)

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MBRP® - Pro Series™ 409 SS Round Exhaust Muffler
MBRP® - Pro Series™ 409 SS Round Exhaust MufflerMBRP® - Pro Series™ 409 SS Round Exhaust Muffler SchemeMBRP® - CatalogMBRP® - Products ComparisonMBRP® - WarrantyMBRP® - FAQMBRP Authorized Dealer
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Universal Fit
Fitment Notes:
  • Not Vehicle Specific
  • To ensure precise fit, please check muffler shape, length and inlet diameter: the latter should match you exhaust pipe diameter.
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Product Details

MBRP Exhaust Systems

Universal Pro Series™ 409 SS Round Exhaust Muffler (M1004S) by MBRP®. Your car is for show and go; add a little show with this polished T304 stainless steel muffler from MBRP. The mirror finish won’t ever peel, flake or corrode. Better yet, it’s free-flowing design will give you more power and save fuel.

Notes: To ensure precise fit, please check muffler shape, length and inlet diameter: the latter should match you exhaust pipe diameter.



Muffler Series: Pro Series™
Muffler Body Material: 409 SS
Muffler Inlet Diameter: 4"
Muffler Outlet Diameter: 4"
Muffler Body Shape: Round
Muffler Body Length: 30"
Muffler Sound: Moderate
Muffler Configuration: Center - Center


  • Dual-core design
  • Polished T304 stainless
  • Milder tone
  • Improves power and torque
  • Fully welded construction
  • Lifetime warranty

Whether your vehicle is a diesel pickup or a musclecar, if it uses a 4” exhaust system, single or double, this muffler will give you extra power and torque, improve your fuel economy at the same time, and deliver a throaty, rumbling exhaust note. Its dual-core design strips away the raspy harshness without adding any impediment to flow. Because it’s made of premium T304 stainless steel, its mirror-polish finish will never peel or flake or turn black. Like all stainless steel, it will acquire a bronze tint after extended periods at high temperature, but that can be polished back off in a few minutes.

Fifteen years ago, MBRP® started in the exhaust business by introducing the B&B Eliminator, a silencer that quickly became the best-selling snow machine muffler of all time. Exhaust system technology being as universal as it is, they soon branched off into cars, Jeeps, and diesel trucks, with amazing success. One of their secrets has been the practice of making as many universal-fit kits as possible. A couple of extra parts in the box means that a single kit might fit a number of different wheelbase pickup trucks, for instance. Reducing complexity in ordering is better for them, better for their distributors, and a great benefit for their customers, who are more likely to be able to find a kit that fits their vehicle on hand. In addition, they go to great lengths to make sure their systems fit properly every time. Careful attention to design and fabrication delivers a system that doesn’t need customization with a hammer to fit properly before the car or truck comes off the lift.

Part Number:

Warranty Information

Damaged Products

All damaged merchandise must be reported to the carrier immediately, within 24 hours, upon the receipt of goods. You will be required to provide a claim report to the carrier prior to contacting your account manager within 2 days. MBRP Inc. will not be responsible for any claim after 3 days of receipt of goods.

The MBRP Inc. warranty applies only to defects in material and workmanship of MBRP Inc. products to the original purchaser on record, providing that installation was completed on the original vehicle for which it was designed and tested for. MBRP Inc. will not warranty the cost of removal or re-installation of this product nor does the warranty apply if the product has been damaged by accident, abuse, misuse or misapplication. The sole obligation of MBRP Inc. will be to repair or replace at its discretion.

MBRP Warranty Terms

  • Installer Series: (aluminixed steel) Three (3) year warranty
  • PLM Series: Limited One (1) year warranty
  • XP Series: (stainless steel T409) Lifetime warranty
  • Pro Series: (stainless steel T304) Lifetime warranty
  • Black Series: One (1) year warranty on the coating and a three (3) Year Warranty on the exhaust components
  • Performance Series:(aluminized steel) Two (2) year warranty
Magnuson-Moss Warranty Act:
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

Vehicle Fitment

This part is universal

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