Flowmaster 40 Series Chambered Muffler
- 2.50 inch offset inlet, 2.50 inch center outlet
- Aggressive sound from the original 40 Series chambered design
- 16-gauge aluminized steel, oval case
- Universal fit for cars, trucks and SUVs
- 9.5 pounds, 20.25 x 10.45 x 4.55 inches
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A loud chambered muffler for muscle cars, street rods, trucks and SUVs with an offset inlet and a center outlet. Universal fit means you must match the pipe size and layout yourself.
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ASIN: B000182DMOModel: 42541Category: Mufflers
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Overview
Routing exhaust from an offset inlet to a center outlet, this chambered muffler is the original Flowmaster chambered design in an oval aluminized steel case. It is sold as a universal fit part and is tuned for an aggressive sound.
The design suits an exhaust that needs a loud, throaty note and it uses the same pipe size at both ends. Universal fit shifts the work to you: no vehicle list is given, so measure the layout before buying.
Who it's for
Made for street cars and trucks where a deep, loud tone is the goal and the pipe layout is offset in and center out. Drivers who need a quiet cabin or a vehicle-specific bolt-in part should look elsewhere.
Pros and cons
- Original 40 Series chambered design
- Aluminized steel body
- Universal fit across vehicle types
- Offset inlet, center outlet layout
- Sound is aggressive, not mild
- Warranty terms not stated
- Vehicle fitment list not given
Performance notes
Chambers inside the case redirect the exhaust gas and cancel sound waves, which gives the deep, loud tone this series is known for. The oval case sets the clearance needed under the car, and the offset-in, center-out layout decides which pipe routing it suits.
Specifications
| Brand | Flowmaster |
|---|---|
| Model | 42541 |
| Dimensions & fit | |
| Inlet size | 2.50 inches |
| Item dimensions | 20.25 x 10.45 x 4.55 inches |
| Weight | 9.5 pounds |
| Construction & materials | |
| Material | Alloy Steel |
| Compatibility & installation | |
| Vehicle type | Car |
| Warranty & support | |
| Warranty | Check with the manufacturer |
| Other details | |
| Configuration | Center/Offset |
| Fit type | Universal Fit |
| Shape | Oval |
| Highlight | 16-gauge aluminized steel, aggressive sound |
Frequently asked questions
Will the Flowmaster 42541 fit my truck or SUV?
It is listed as universal fit, and the highlight names muscle cars, street rods, trucks and SUVs. You still need to match the 2.50 inch inlet and the offset-in, center-out layout.
What is the pipe size on the Flowmaster 42541?
The title gives a 2.50 inch offset inlet and a 2.50 inch center outlet.
Is the Flowmaster 42541 a quiet muffler?
No. The listing calls it aggressive sound.