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Black Diamond Unlimited

Exhaust - 40 series original mufflers - FLOWMASTER

Diesel Truck Exhaust Parts

Diesel truck exhaust systems are unique due to their ability to handle the high pressures and temperatures that diesel engines generate. The right components are critical for optimizing airflow, reducing back pressure, and maintaining emission standards.

Get premium diesel truck exhaust parts designed for power, durability, and performance at Black Diamond Unlimited. Whether you need exhaust kits, pipes, tubes, wraps, sleeves, hangers, clamps, or flanges, our diesel truck exhaust accessories deliver unmatched reliability and precision.

We ensure you have everything you need to enhance your truck’s efficiency and extend its lifespan, whether that’s pipes and tubes for your diesel truck’s exhaust or a completely new system. Trust us for quality parts designed to go the distance.

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Flowmaster 42441 2.25IN (O)/OUT (C) 40 SERIES

Flowmaster 42441 2.25IN (O)/OUT (C) 40 SER..

Brand: Flowmaster

Part Number: 42441

40 Series - 2.25 Offset In / 2.25 Center Out - Aggressive SoundThe Original 40 series muffler deliv..

$99.95

Flowmaster 42442 2.25IN(C)/OUT(O) 40 SERIES

Flowmaster 42442 2.25IN(C)/OUT(O) 40 SERIE..

Brand: Flowmaster

Part Number: 42442

40 Series - 2.25" IN(C)/OUT(O) - Aggressive SoundThe Original 40 series muffler delivers an aggress..

$99.95

Flowmaster 42443 2.25IN(O)/OUT(O) 40 SERIES

Flowmaster 42443 2.25IN(O)/OUT(O) 40 SERIE..

Brand: Flowmaster

Part Number: 42443

40 Series - 2.25 Offset In / 2.25 Offset Out - Aggressive SoundThe Original 40 series muffler deliv..

$99.95

Flowmaster 425403 2.50IN(D)/3OUT(C) 40 SERIES

Flowmaster 425403 2.50IN(D)/3OUT(C) 40 SER..

Brand: Flowmaster

Part Number: 425403

40 Series - 2.50 Dual In / 3.00 Center Out - Aggressive SoundThe Original 40 series muffler deliver..

$99.95

Flowmaster 425404 2.50 IN(D)/OUT(D) 40 SERIES

Flowmaster 425404 2.50 IN(D)/OUT(D) 40 SER..

Brand: Flowmaster

Part Number: 425404

40 Series - 2.50" IN(D)/OUT(D) - Aggressive SoundThe Original 40 series muffler delivers an aggress..

$99.95

Flowmaster 42541 2.5IN (O)/OUT (C) 40 SERIES

Flowmaster 42541 2.5IN (O)/OUT (C) 40 SERI..

Brand: Flowmaster

Part Number: 42541

40 Series - 2.50 Offset In / 2.50 Center Out - Aggressive SoundThe Original 40 series muffler deliv..

$99.95

Flowmaster 42542 2.50IN(C)/OUT(O) 40 SERIES

Flowmaster 42542 2.50IN(C)/OUT(O) 40 SERIE..

Brand: Flowmaster

Part Number: 42542

40 Series - 2.50" IN(C)/OUT(O) - Aggressive SoundThe Original 40 series muffler delivers an aggress..

$99.95

Flowmaster 430402 3IN (C)/2.5OUT (D) 40 SERIES

Flowmaster 430402 3IN (C)/2.5OUT (D) 40 SE..

Brand: Flowmaster

Part Number: 430402

40 Series - 3.00 Center In / 2.50 Dual Out - Aggressive SoundThe Original 40 series muffler deliver..

$99.95

Flowmaster 43041 3IN (O)/3OUT (C) 40 SERIES

Flowmaster 43041 3IN (O)/3OUT (C) 40 SERIE..

Brand: Flowmaster

Part Number: 43041

40 Series - 3.00 Offset In / 3.00 Center Out - Aggressive SoundThe Original 40 series muffler deliv..

$99.95

Flowmaster 80430402 3IN(C)/2.5OUT(D) 40 SERIES 409S

Flowmaster 80430402 3IN(C)/2.5OUT(D) 40 SE..

Brand: Flowmaster

Part Number: 80430402

40 Series Stainless Steel - 3.00 Center In / 2.50 Dual Out - Aggressive SoundThe Original 40 series..

$123.95

Flowmaster 8043043 3 IN(O)/OUT(O) 40 SERIES 409S

Flowmaster 8043043 3 IN(O)/OUT(O) 40 SERIE..

Brand: Flowmaster

Part Number: 8043043

40 Series Stainless Steel - 3.00 Offset In / 3.00 Offset Out - Aggressive SoundThe Original 40 seri..

$123.95

Flowmaster 42543 2.5IN(O)/OUT(O) 40 SERIES

Flowmaster 42543 2.5IN(O)/OUT(O) 40 SERIES

Brand: Flowmaster

Part Number: 42543

40 Series - 2.50 Offset In / 2.50 Offset Out - Aggressive SoundThe Original 40 series muffler deliv..

$99.95

Flowmaster 43043 3IN (O)/OUT (O) 40 SERIES

Flowmaster 43043 3IN (O)/OUT (O) 40 SERIES

Brand: Flowmaster

Part Number: 43043

40 Series - 3.00 Offset In / 3.00 Offset Out - Aggressive SoundThe Original 40 series muffler deliv..

$99.95

Flowmaster 8042441 2.25 IN(O)/OUT(C) 40 SERIES 409S

Flowmaster 8042441 2.25 IN(O)/OUT(C) 40 SE..

Brand: Flowmaster

Part Number: 8042441

40 Series Stainless Steel - 2.25 Offset In / 2.25 Center Out - Aggressive SoundThe Original 40 seri..

$123.95

Flowmaster 8042443 2.25 IN(O)/OUT(O) 40 SERIES 409S

Flowmaster 8042443 2.25 IN(O)/OUT(O) 40 SE..

Brand: Flowmaster

Part Number: 8042443

40 Series Stainless Steel - 2.25 Offset In / 2.25 Offset Out - Aggressive SoundThe Original 40 seri..

$123.95

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