Flowmaster 70 Series Big Block II Mufflers

4.69 out of 5 stars 118 Customer Reviews

These 70 Series Big Block II mufflers are designed around a large case for maximum volume and efficiency. They're 2 in. narrower than the original Big Block muffler, making them easier to install into tight areas. Other features include a mild, mellow exhaust tone and a resonant tuning chamber for reduced interior sound levels.

Results 1 - 11 of 11

Flowmaster 70 Series Big Block II Steel 3 Inch Muffler 53070

Muffler, Big Block II 70 Series, 3 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-53070

4.64 out of 5 stars ( 22 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II 409 Stainless Steel 3 Inch Muffler 853072

Muffler, 70 Series Big Block II, Oval, Stainless, 3 in. Center Inlet, 3 in. Offset Outlet, 22 in. Case Length

Part Number: FLO-853072

4.65 out of 5 stars ( 26 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 2.5 Inch Muffler 52573

Muffler, Big Block II 70 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-52573

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 3 Inch Muffler 53071

Muffler, Big Block II 70 Series, 3 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-53071

4.5 out of 5 stars ( 18 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 2.5 Inch Muffler 52571

Muffler, Big Block II 70 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-52571

4.89 out of 5 stars ( 9 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 2.5 Inch Muffler 52572

Muffler, Big Block II 70 Series, 2 1/2 in. Inlet/2 1/2 in. Outlet, Steel, Black, Steel, Each

Part Number: FLO-52572

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 3 Inch Muffler 530702

Muffler, Big Block II 70 Series, 3 in. Inlet/Dual 2 1/2 in. Outlet, Steel, Black, Each

Part Number: FLO-530702

4.88 out of 5 stars ( 8 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 2.25 Inch Muffler 524703

Muffler, Big Block II 70 Series, Dual 2 1/4 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-524703

4.54 out of 5 stars ( 13 )

Estimated Ship Date: May 27, 2025 if ordered today

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Estimated Ship Date: May 27, 2025 if ordered today

Flowmaster 70 Series Big Block II Steel 3 Inch Muffler 530722

Muffler, Big Block II 70 Series, 3 in. Inlet/Dual 2 1/4 in. Outlets, Steel, Black, Each

Part Number: FLO-530722

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 2.25 Inch Muffler 524704

Muffler, Big Block II 70 Series, Dual 2 1/4 in. Inlet/Dual 2 1/4 in. Outlet, Steel, Black, Each

Part Number: FLO-524704

4.86 out of 5 stars ( 7 )

Estimated Ship Date: Tomorrow

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Flowmaster 70 Series Big Block II Steel 3 Inch Muffler 53072

Muffler, Big Block II 70 Series, 3 in. Inlet/3 in. Outlet, Steel, Black, Each

Part Number: FLO-53072

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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