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Flowmaster 40 Series Mufflers
As seen advertised on Horsepower TV!

Flowmaster 40 series mufflers.

The original two chamber Flowmaster muffler!

Flowmaster 42441, 42541, 42443, 42543, 430402.

Preferred by Mustang other muscle car owners.

Flowmaster 40 series mufflers feature all welded steel cases (no stamped seams to blow out).

Internal chambers to dampen sound. (no fiberglass packing to blow out)

Flowmaster 40 series mufflers are made of extra heavy gauge steel.

Aluminized for rust protection.

Click the applications drop down box to select your muffler.

Flowmaster 40 series two chamber muffler 42441 42541 42443 43543 43042 40series$83.97APPLICATIONS:: 

1. If there is an applications box, click, then scroll the applications box to find your vehicle.

2. Click on your vehicle.

3. Click "add to cart"

4. Enter your information and submit order.

5. If there is no applications box, then just click "add to cart", then enter your information.

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HOURS: 11:00 am to 6:00 pm Monday - Friday Eastern Standard Time

We welcome CANADIAN customers! For ordering information, click on "Orders To Canada" at the top left side of this page.

We will not ship to freight forwarding - expediting companies.

PAYMENT METHODS: PayPal, Visa, Mastercard, Discover, American Express, money orders.

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