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Home / Exhaust / Muffler / Flowmaster PRO 4.00 IN/4.00 OUT 20 in. Muffler
Flowmaster PRO 4.00 IN/4.00 OUT 20 in. Muffler
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Flowmaster

Flowmaster PRO 4.00 IN/4.00 OUT 20 in. Muffler

PART 14020100CATEGORY Muffler
$306.95
MSRP $345.95You save $39.00
$306.95
1

Product information

Manufacturer information. Check the part number and installation requirements for your vehicle.

Supplier details checked 2026-09-23 · Test catalog

Some supplier details are unavailable for this product.

Product description

Pro Series Muffler - 4.00 Center In / 4.00 Center Out - Moderate Sound

Flowmaster Pro Series Muffler

Features

Durable fully welded 16 gauge stainless steel case

High horsepower apps include diesels/RVs/trucks

409 Stainless Steel Internal Construction

Race Proven Design

Manufacturer notes

Universal Muffler - Not a direct fit. Some adaptation required.

Supplier category
Exhaust, Mufflers & Tips
Supplier subcategory
Muffler
UPC / barcode
700042021383
Units per product
1
Supplier Proposition 65 status
Y
Supplier EPA status
N/A
Air freight prohibited
No
Not CARB approved
No
CARB acknowledgement required
No
Freight delivery required
No
Powersports product
No

Manuals and documents

More manufacturer information

Other product descriptions

Flowmaster PRO 4.00 IN/4.00 OUT 20 in. Muffler

PRO 400 IN400 OUT 20 IN

MUFF PRO 4.00 IN/4.0

About the manufacturer

The Pro Series mufflers work on all applications ranging from street trucks, diesel pullers and RV pushers to every class of racing on dirt or asphalt. During development, at the dyno and track, the Pro Series mufflers consistently delivered performance that is equal to or surpasses open pipe systems, while dramatically reducing sound levels across the RPM range.

Additional manufacturer information

MUFF 4.00IN

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Flowmaster PRO 4.00 IN/4.00 OUT 20 in. Muffler | Q40 Motorsports