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🔥 Own the street with the iconic roar of Flowmaster’s 40 Series!
The Flowmaster 40 Series Original Chambered Muffler delivers a bold, aggressive exhaust tone with its classic two-chambered design. Crafted from durable 16-gauge aluminized steel and fully MIG-welded, it enhances horsepower and torque by improving airflow and reducing back pressure. Designed for universal fitment, it’s perfect for muscle cars, street rods, trucks, SUVs, and custom builds seeking legendary sound and proven performance.
| ASIN | B000182DMO |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #20,491 in Automotive ( See Top 100 in Automotive ) #4 in Automotive Performance Exhaust Mufflers #192 in Automotive Emission & Exhaust Products |
| Brand | Flowmaster |
| Brand Name | Flowmaster |
| Compatible with Vehicle Type | Car |
| Configuration | Center/Offset |
| Customer Reviews | 4.8 out of 5 stars 411 Reviews |
| Global Trade Identification Number | 00700042010332, 00700042029426 |
| Included Components | Flowmaster 42541 40 Series Muffler - 2.50 Offset IN / 2.50 Center OUT - Aggressive Sound |
| Item Dimensions | 19.7 x 10.2 x 4.5 inches |
| Item Type Name | Flowmaster 42541 40 Series Muffler - 2.50 Offset IN / 2.50 Center OUT - Aggressive Sound |
| Item Weight | 8.4 Pounds |
| Item dimensions L x W x H | 19.7 x 10.2 x 4.5 inches |
| Manufacturer | Flowmaster |
| Manufacturer Part Number | 42541 |
| Manufacturer Warranty Description | Check with the manufacturer |
| Material | Alloy Steel |
| Material Type | Alloy Steel |
| Model Number | 42541 |
| OEM Equivalent Part Number | 42541 |
| Part Interchange Info | 42541 |
| Shape | Oval |
| UPC | 700042010332 700042029426 |
| Unit Count | 1.0 Count |
| Vehicle Service Type | Car |
E**.
👌
Put this on my wife's jeep commander with the 5.7 hemi. It sounds great
N**A
Sounds great, dented both mufflers in in shipping
Flowmasters are good, both mufflers were dented pre Amazon packaging I believe, they are going on a 50k show car and need them for the car show this weekend, no time to return or exchange. Pretty disappointed in packaging and shipping. Flowmasters are good sounding parts, nothing to complain on the brand itself. 1970 mustang, with a built 351C, gives it the classic muscle car sound, will be hitting the dyno next week to see if I loose or gain any HP
B**T
2010 Ford F-150 4.6L V8
Perfect amount of sound for me a 35 year old. Great idle, great sound when giving it just a little gas and on the highway. Left my resonator on and so I haven’t noticed any drone on the highway with the radio on just on low volume. Would buy again.
2**P
Price
Sounds great for me needed more
T**E
Fantastic mufflers
I'm running a 454" powered '71 Corvette that has a high-performance factory cam, a high-rise Edelbrock intake, and a 3310-2 Holley carburetor. Up until now I had a set of stock mufflers on it and it would fall flat on it's face at around 3600 rpm. After installing these 40-Series Flowmasters it blasts up to it's 5500 rpm red line with no signs of exhaust restriction whatsoever. And as I'm also running a heavily-modified TH700R4 the amount of exhaust drone at cruising speeds is very small. For those of you who want a very decent street/strip muffler at an affordable price these 40-Series Flowmasters are the way to go. And with the free shipping they're even better.
A**N
Easy Install!
Super easy to install and sounds amazing for my 5.7 hemi!
D**.
Smooth sound
I bought this muffler for my 2011 F-150 5.0 Super Crew. I kept the stock resonator on and had a turn down right after the rear axle. I kept the resonator because I have a 6 month old and I did not want it to be too loud. It has a nice smooth tone, and you know it's there when driving and idling. I gave it four stars because as soon after I put it on my gas mileage dropped 2-3 mpg, and no it's not from led footing it. I was driving the speed limit and using cruise control. After a couple of days of driving my mileage was back to normal. Guess it just took a couple of days for all 123 computers on the truck to learn something was different. But it has a great deep sound.
C**K
flowmaster quality
good solid muffler i have not installed it yet but it should fit perfect would recommend this muffler to anybody wanting to make they truck to sound loud and aggressive 👌 update. i welded this muffler on my 2000 F-150 V8 and it fits perfect thought it was going to be allot louder but its not much more louder than the stock muffler its got a nice rumble when you accelerate fast overall its i good muffler for someone wanting there truck have a rumble but not an obnoxious loud 👍
R**.
Great quality
All as explained and expected. Amazing mufflers.
T**N
Sounds great!
Sounds great like all the other Flow Master exhausts I’ve had installed! Highly recommend for a GM 5.3 engine.
F**I
Good Product and Service !!
A+ A+ A+
R**Y
Excellent!!!
Love the sound. Not overly loud just a very nice throaty sound.
K**A
Nice sound
I bought this for my 2016 Ford F150 V6. Even though is says it doesn't fit pipes can be made to make it fit. It has a nice throaty sound at idle and up to 5000 rpms on a V6. Much better than the stock muffler. I also deleted the resonator. Good product
Trustpilot
4 days ago
1 month ago