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Flowmaster 40 Series Mufflers 42541

Flowmaster 42541 - Flowmaster 40 Series Mufflers

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Muffler, American Thunder 40 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

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Brand: Flowmaster

Manufacturer's Part Number: 42541

Part Type: Mufflers

Product Line: Flowmaster 40 Series Mufflers

Summit Racing Part Number: FLO-42541

UPC: 700042010332

Muffler Material: Steel

Case Shape: Oval

Inlet Diameter (in): 2.500 in.

Inlet Quantity: One

Inlet Location: Offset

Outlet Diameter (in): 2.500 in.

Outlet Quantity: One

Outlet Location: Center

Reversible: No

Internal Construction: Chambered

Muffler Finish: Black

Case Exterior Length (in.): 13.000 in.

Overall Length (in): 19.000 in.

Thickness (in): 4.000 in.

Width (in): 9.750 in.

Outlet Style: Standard, without tip

Quantity: Sold individually.

In-Store Pickup: Choose In-store pick-up (OH, NV, GA, TX) on our web site.

Looking for the most aggressive sound in the Flowmaster muffler line? Then take a look at these 40 series mufflers. Designed for use on street and strip vehicles, they take the sound waves produced in the exhaust, and cancel them against angled baffles built into the muffler case. This improves both horsepower and fuel economy. Best of all, they allow you to hear that cool Flowmaster tone inside of the vehicle, as well as outside. So, if you want more power and less noise, then you've gotta get these Flowmaster mufflers.

Warranty

Questions & Answers Ask a Product Question
Q:

Are these loud mufflers?I`m looking for something that has some sound to it but not too load.I have a stock 396 350 hp motor.

Asked by on August 24, 2017

A:

I have had the 40 series on 5 or 6 different cars. The sound is what I really like, not to loud at low rpm's, but gets a real good sound when the rpm's comes up. Should sound good on your BBC with 2.5 in. exhaust or bigger.

RICK L from IN answered on August 27, 2017

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Q:

So I bought one of these for my Dakota R/T and it sounds good at low rpm but as my rpm’s get higher it goes quiet... all I can hear is the air passing through it no rumble at all lol and the one I recieved wasnt painted maybe I got the wrong one by mistake ? Any help would be appreciated

Asked by DEVON on November 20, 2017

A:

I don’t think it was installed backwards the inlet was labelled and the guys been doing it for years , and 2003 and ok was just expecting it to be louder

DEVON from Canada answered on November 27, 2017

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Q:

Will the black paint on these burn off? Do I need to sand them down and paint with high temp paint if I wanna keep them looking good?

Asked by BRIAN on May 10, 2019

A:

No ive had mine on for a while and it still looks good also it’s flowmaster which is a really good brand

RONNIE from OH answered on May 10, 2019

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Q:

Does this muffler come with muffler clamps or do they need to be purchased separately?

Asked by MICHAEL on March 02, 2020

A:

No. The muffler comes alone. Everything you want must be purchased separately.

ROBERT from CA answered on March 05, 2020

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Most Helpful Reviews Review This Product

55 Customer Reviews for Flowmaster 42541 - Flowmaster 40 Series Mufflers

Average Customer Review

5 Star

(44)

4 Star

(7)

3 Star

(0)

2 Star

(2)

1 Star

(2)

+See All 55 Reviews

great

Summit RacingSummit Racing Verified Purchase

FLO-42541
I love the sound of flowmasrers always a great product.

2 of 2 found this review helpful.

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Reviewer: from OR

Date: August 19, 2014

Appearance
Ease of Installation
Price/Value
Quality

Sounds great

Summit RacingSummit Racing Verified Purchase

FLO-42541
Flowmaster quality. Price is a little high, but sounds great even on a stock 350.

1 of 1 found this review helpful.

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Reviewer: from OR

Date: November 16, 2015

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Ease of Installation
Price/Value
Quality

FLOWMASTER 40 series (Fast Shipping)

Summit RacingSummit Racing Verified Purchase

FLO-42541
Muffler sounds great and fast shipping. I would buy another

1 of 1 found this review helpful.

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Reviewer: from MI

Date: January 26, 2015

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Ease of Installation
Price/Value
Quality

Great sound!!!

Summit RacingSummit Racing Verified Purchase

FLO-42541
These 40 series mufflers have the perfect sound and tone.Not too loud but they still roar when you stomp on the gas. Overall very happy with them

1 of 1 found this review helpful.

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Reviewer: from WA

Date: December 08, 2014

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Price/Value
Quality

Flow master quality

Summit RacingSummit Racing Verified Purchase

FLO-42541
Need not say anymore, Flowmaster is built with quality in mind. All welds on these mufflers are pennied perfectly. These mufflers produce the perfect deep rumble you want for your old truck or muscle car without the loud snap of a glass pack. Self installed On my 1971 F250 390 FE with long, full length headers (4x4) and H pipe - all exhaust is 2.5” diameter post 3” header collectors. ...read more

0 of 0 found this review helpful.

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Reviewer: from CA

Date: April 19, 2020

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Price/Value
Quality

Some parts are not legal for use in California or other states with similar laws / regulations

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