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.
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.