MerCruiser Exhaust
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OEM MerCruiser 3.0 Exhaust Riser Elbow 12076A2
Mercury Marine / Quicksilver
$367.99 $330.93OEM MerCruiser 3.0 Exhaust Riser Elbow 12076A2 Exhaust Elbow: 3.0L/3.0LX 1995+,Fits MCM 2.5L & 3.0L/LX (1982 & newer); also MCM 470 (1977-1982) Alternate - SIE 19751 18-1975 47-19751 Please...- Part Number:
- 710-12076A2
- Availability:
- In Stock - Ships same or next business day.
$367.99 $330.93 -
Sierra MerCruiser 2.5 3.0 Liter Exhaust Manifold 860235A04 18-1956-2 18-1956-3
Sierra
$630.49 $536.12MerCruiser 4 cylinder manifold exhaust kit by Sierra Fits most 2.5 & 3.0L earlier than 1990 Replaces: • MerCruiser part#: 860235A04 • Marine Power 600333 Ol- Part Number:
- 47-19563
- Availability:
- In Stock - Ships same or next business day.
$630.49 $536.12 -
Sierra MerCruiser 3.0 Exhaust Manifold 1990+ 806867A3 860235A03 18-1966 18-1966-1
Sierra
$677.49 $530.46MerCruiser EXHAUST MANIFOLD by Sierra Manifold for 3.0 Liter Engines 1990 and Newer using the "MERCARB" This has a single idle air adjusting screw Includes: • Gaskets<- Part Number:
- 47-19661
- Availability:
- In Stock - Ships same or next business day.
$677.49 $530.46 -
Sierra MerCruiser 350 305 5.0 5.7 Dry Joint Exhaust Manifold 865735A02 18-1843
Sierra
$670.99 $494.99Replacement MerCruiser Dry Joint Manifold by Sierra Includes gasket for manifold to head and bolts. Dry Joint Style Exhaust Manifold for MerCruiser Replaces: •- Part Number:
- 47-1843
- Availability:
- In Stock - Ships same or next business day.
$670.99 $494.99 -
Sierra MerCruiser 5.7 350 / 5.0 305 V8 Exhaust Manifold & 3 inch Riser Kit 18-1953-2 18-1970-2
Sierra
$1,374.76 $999.99Sierra MerCruiser 5.7 350 V8 Center Riser Exhaust Manifold & Riser Kit Fits Applications: V-8 305, 350 & 377 Engines from Years 1984 and earlier with 3 inch riser outlets 2x Manifold...- Part Number:
- k-sierra350-3
- Availability:
- In Stock - Ships same or next business day.
$1,374.76 $999.99 -
Sierra Marine "14 DEGREE" DRY JOINT MerCruiser Riser Elbow 864591T02 18-1845
Sierra
$467.89 $399.9914 degree Riser 18-1845 Replaces: • Barr: MC-2-0864591 • MerCruiser: 864591T02 Includes bolts- Part Number:
- 47-1845
- Availability:
- In Stock - Ships same or next business day.
$467.89 $399.99 -
Sierra MerCruiser 7.4 454 502 Exhaust Manifold & Riser Kit 18-1957-1 18-1957-2 18-1976-2
Sierra
$1,368.16 $1,049.99Sierra MerCruiser 7.4 454 502 Big Block V8 Center Riser Exhaust Manifold & Riser Kit 2x Manifold 18-1957-1 SS to 18-1957-2 Replaces • Osco: 9011A- Part Number:
- k-sierra454
- Availability:
- In Stock - Ships same or next business day.
$1,368.16 $1,049.99 -
Sierra MerCruiser 5.7 350 / 5.0 305 / 6.2 377 V8 Exhaust Manifold & Riser Kit 18-1953-2 18-1976-2
Sierra
$1,213.96 $999.99Sierra MerCruiser 5.7 350 V8 Center Riser Exhaust Manifold & Riser Kit Fits Applications: V-8 305, 350 & 377 Engines from Years 1983-2002 (Port or Starboard Side) Will not work with Dry Joint! 2x...- Part Number:
- K-SIERRA350
- Availability:
- In Stock - Ships same or next business day.
$1,213.96 $999.99 -
Sierra MerCruiser 4.3 V6 Exhaust Manifold & Riser Kit 18-1952-1 18-1976-2
Sierra
$1,308.76 $1,019.99Sierra Exhaust Manifold and Riser Kit for MerCruiser V6 4.3 Liter 2x Manifold 18-1952-1 Replaces: • Osco: 9745 • <- Part Number:
- k-sierra262
- Availability:
- In Stock - Ships same or next business day.
$1,308.76 $1,019.99 -
Sierra MerCruiser 4 inch Exhaust Riser Elbow 18-19762 18-1976-1
Sierra
$257.59 $250.99Sierra MerCruiser 4 inch Exhaust Riser Elbow For most MerCruiser engines V6 and V8 ( 4.3 5.0 5.7 6.2 7.4 ) Applications 7" (4" O.D. Riser) Comes as shown in the pictures with bolts and gaskets.- Part Number:
- 47-19762
- Availability:
- In Stock - Ships same or next business day.
$257.59 $250.99 -
Sierra MerCruiser Big Block V8 Exhaust Manifold 7.4 454 502 807078t10 807078t08 18-19571 18-1957-2
Sierra
$426.49 $327.99Sierra Replacement Manifold Kit for MerCruiser Big Block V8 454 / 502 Engines 18-1957-2 Comparable Part Numbers: • Osco: 9011A • GLM: 51240 • MerCruiser: 89011A8 , 807078T08 , 807078T10 , 89011- Part Number:
- 47-19572
- Availability:
- In Stock - Ships same or next business day.
$426.49 $327.99 -
Sierra MerCruiser 5.7 5.0 350 305 V8 Exhaust Manifold 860246q11 860246A10 860246a15 860246-c 18-1953-2
Sierra
$349.39 $224.99Sierra MerCruiser V8 Center Riser Exhaust Manifold Fits Applications: V-8 305, 350 & 377 Engines from Years 1983-2002 (Port or Starboard Side) Will not work with Dry joint! Replaces:&nb- Part Number:
- 47-19532
- Availability:
- In Stock - Ships same or next business day.
$349.39 $224.99 -
On Sale
Sierra MerCruiser "14 Degree" dry joint V8 Exhaust Manifold & Riser Kit 18-1845 18-1843
Sierra
$2,277.76 $1,759.99New Sierra marine dry joint exhaust Kit with 14 Degree Riser Fits: • 2004 and newer MCM GM V-6 & V-8 (305 350 & 377 cid) engines with dry joint exhaust manifold (s/n 0W310000 and up) •&nbs- Part Number:
- k-sierra350dry
- Availability:
- In Stock - Ships same or next business day.
$2,277.76 $1,759.99 -
SEA-DOG LINE EXHAUST THRU-HULL 3" SS 521130
SEA-DOG LINE
$151.35 $116.76Sea-Dog Line - 521130 EXHAUST THRU-HULL 3 SS EXHAUST THRU-HULL (SEA-DOG LINE) Stainless flap with rubber seal Cast 316 Stainless Hose 3" Length 5-7/8" Alternate - SDG 521- Part Number:
- 354-521130
- Availability:
- In Stock - Ships same or next business day.
- A:
- 2-9/16"
- B:
- 5"
- C:
- 5-7/8"
- D:
- 4-1/2"
- E:
- 3"
$151.35 $116.76 -
SEA-DOG LINE EXHAUST THRU-HULL 2-1/2" SS 521125
SEA-DOG LINE
$151.35 $116.76Sea-Dog Line - 521125 EXHAUST THRU-HULL 2-1/2 SS EXHAUST THRU-HULL (SEA-DOG LINE) Stainless flap with rubber seal Cast 316 Stainless Hose 2-1/2" Length 5-7/8" Alternate -- Part Number:
- 354-521125
- Availability:
- In Stock - Ships same or next business day.
- A:
- 2-9/16"
- B:
- 5"
- C:
- 5-7/8"
- D:
- 4-1/2"
- E:
- 2-1/2"
$151.35 $116.76 -
Sierra MerCruiser 4.3 Liter V6 Exhaust Manifold 99746A17 9975 18-19521
Sierra
$429.49 $327.71Sierra 18-1952-1 Replacement Exhaust Manifold Kit For MerCruiser V6 4.3 Liter 02 and older engines Will not work for dry joint systems Kit Contains: • 1x Exha- Part Number:
- 47-19521
- Availability:
- In Stock - Ships same or next business day.
$429.49 $327.71 -
SEACHOICE EXHAUST GARD COVER-4 (2/CARD 28361
Seachoice
$36.84 $32.37Seachoice - 28361 EXHAUST GARD COVER-4 (2/CARD EXHAUST GUARD COVER) Black rubber with adjustable stainless steel clamp. Flap valve prevents following seas from entering exhaust outlet when stopping...- Part Number:
- 50-28361
- Availability:
- In Stock - Ships same or next business day.
$36.84 $32.37 -
Sierra EXHAUST FLAPPER 5-6 INCH 18-4458
Sierra
$89.89 $69.11Sierra_47 - 18-4458 EXHAUST FLAPPER 5-6 INCH EXHAUST PROTECTOR VALVE (Sierra) Includes: • Stainless steel hose clamp • Weather resistant rubber flapper valve Replaces OEM No:- Part Number:
- 47-4458
- Availability:
- In Stock - Ships same or next business day.
$89.89 $69.11 -
Sierra EXHAUST FLAPPER 4 INCH 18-4457
Sierra
$45.39 $35.03Sierra_47 - 18-4457 EXHAUST FLAPPER 4 INCH EXHAUST PROTECTOR VALVE (Sierra) Includes: • Stainless steel hose clamp. • Weather resistant rubber flapper valve Replaces: MerCruiser 12644A <- Part Number:
- 47-4457
- Availability:
- In Stock - Ships same or next business day.
$45.39 $35.03 -
Sierra EXHAUST FLAPPER 3 INCH 18-4456
Sierra
$46.69 $34.27Sierra_47 - 18-4456 EXHAUST FLAPPER 3 INCH EXHAUST PROTECTOR VALVE (Sierra) Includes: • Stainless steel hose clamp • Weather resistant rubber flapper valve Replaces: MerCruiser 34565A1, A2- Part Number:
- 47-4456
- Availability:
- In Stock - Ships same or next business day.
$46.69 $34.27
MerCruiser Exhaust
If you want maximum performance and long-term reliability from your MerCruiser inboard engine, routine maintenance of your exhaust system is essential. Corrosion and normal wear can damage exhaust components, leading to poor performance or even serious engine issues. At PowerBoatSupply.com, you’ll find a wide selection of MerCruiser exhaust system parts—including exhaust manifolds, risers, bellows, and other replacement parts to keep your motor running at its best. We carry OEM MerCruiser parts as well as trusted aftermarket options from Sierra and other leading manufacturers.
MerCruiser Exhaust Risers
The exhaust riser is a critical component that should be inspected regularly as part of routine maintenance. At PowerBoatSupply.com, we stock the latest designs that efficiently collect hot gasses from the engine and cool them with a water-filled jacket. This process improves exhaust flow, boosts engine performance, and extends the lifespan of your motor.
MerCruiser Exhaust Manifolds and Components
Whether you need a new MerCruiser transom assembly, exhaust elbows, gaskets, or bolts, PowerBoatSupply.com is your one-stop shop for high-quality parts. From durable MerCruiser exhaust manifolds to complete MerCruiser outdrives, we provide everything you need for annual maintenance or complete rebuilds. With premium OEM and aftermarket options, you’ll spend less time in the shop and more time on the water. With over 35 years of experience in marine engine parts and service, we know the difference quality makes when you rely on your boat’s engine.
Find Quality MerCruiser Exhaust Parts
Shop our full inventory of MerCruiser exhaust components today and get the parts you need shipped fast, so your boat is always ready for the next adventure.