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  • Exhaust
    • Exhaust
    • Performance Exhaust Systems
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      • Street Performance
      • View All
    • Standard Replacement Exhaust Systems
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      • Exhaust Bolts, Nuts & Studs
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Exhaust Reducers & Couplers

Building or repairing an exhaust system often involves connecting pipes that were never designed to meet. A custom manifold, a performance muffler, or a universal catalytic converter can introduce different pipe diameters that bring a project to a halt. This is where exhaust reducers and adapters become the most critical components in your toolkit. 

They are the problem-solvers that bridge the gap, allowing you to mix and match parts to create a seamless, leak-free system. A high-quality exhaust reducer does more than just connect two pipes - it manages airflow efficiently, preventing bottlenecks that can rob your engine of power. Our collection is built to give you the precise fitment needed for any custom fabrication or repair job, turning a potential roadblock into a simple, effective connection.

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Showing 28 Results
3.5" Stainless Steel Oval to Round Exhaust Adaptor Pipe (RD350-OV)

3.5" Stainless Steel Oval to Round Exhaust Ad

Now $29.60 WAS $37.00

On Sale
REDUCER TAPERED CONE - 3.5" (89MM) TO 2.5" (63MM) X 4" LONG (304 STAINLESS STEEL)

REDUCER TAPERED CONE - 3.5" (89MM) TO 2.5&quo

$28.00

MILD STEEL EXHAUST REDUCER 5" (127MM) TO 4" (101MM) OD/OD

MILD STEEL EXHAUST REDUCER 5" (127MM) TO 4&qu

$41.00

3" Stainless Steel Oval to Round Exhaust Adaptor Pipe (RD300-OV)

3" Stainless Steel Oval to Round Exhaust Adap

Now $27.20 WAS $34.00

On Sale
4" Stainless Steel Oval to Round Exhaust Adaptor Pipe (RD400-OV)

4" Stainless Steel Oval to Round Exhaust Adap

Now $35.20 WAS $44.00

On Sale
MILD STEEL EXHAUST REDUCER 2 1/2" (63MM) TO 2 1/4" (57MM) OD/OD

MILD STEEL EXHAUST REDUCER 2 1/2" (63MM) TO 2

$31.00

MILD STEEL EXHAUST REDUCER 2 1/2" (64MM) TO 2" (51MM) OD/OD

MILD STEEL EXHAUST REDUCER 2 1/2" (64MM) TO 2

$23.00

MILD STEEL EXHAUST REDUCER 2 1/4" (57MM) TO 2" (51MM) OD/OD

MILD STEEL EXHAUST REDUCER 2 1/4" (57MM) TO 2

$14.00

MILD STEEL EXHAUST REDUCER 2 3/4" (70MM) TO 2 1/2" (63MM) OD/OD

MILD STEEL EXHAUST REDUCER 2 3/4" (70MM) TO 2

$31.00

MILD STEEL EXHAUST REDUCER 3 1/2" (89MM) TO 3" (76MM) OD/OD

MILD STEEL EXHAUST REDUCER 3 1/2" (89MM) TO 3

$31.00

MILD STEEL EXHAUST REDUCER 3" (76MM) TO 2 1/2" (64MM) OD/OD

MILD STEEL EXHAUST REDUCER 3" (76MM) TO 2 1/2

$31.00

MILD STEEL EXHAUST REDUCER 3" (76MM) TO 2 3/4" (70MM) OD/OD

MILD STEEL EXHAUST REDUCER 3" (76MM) TO 2 3/4

$31.00

MILD STEEL EXHAUST REDUCER 3" (76MM) TO 2" (51MM) OD/OD

MILD STEEL EXHAUST REDUCER 3" (76MM) TO 2&quo

$31.00

MILD STEEL EXHAUST REDUCER 4 1/2" (114MM) TO 4" (101MM) OD/OD

MILD STEEL EXHAUST REDUCER 4 1/2" (114MM) TO

$38.00

MILD STEEL EXHAUST REDUCER 4" (101MM) TO 3" (76MM) OD/OD

MILD STEEL EXHAUST REDUCER 4" (101MM) TO 3&qu

$36.00

MILD STEEL EXHAUST REDUCER 4" (101MM) TO 3.5" (89MM) OD/OD

MILD STEEL EXHAUST REDUCER 4" (101MM) TO 3.5&

$34.00

MILD STEEL EXHAUST REDUCER 5" (127MM) TO 4 1/2" (114MM) OD/OD

MILD STEEL EXHAUST REDUCER 5" (127MM) TO 4 1/

$42.00

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 2 1/4" 57MM ID/ID

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 2 1/4&q

$24.00

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 2" 51MM ID/ID

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 2"

$23.00

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 2.5" 63MM ID/ID (EXD2500)

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 2.5&quo

Now $19.60 WAS $24.50

On Sale
MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 3" 76MM ID/ID

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 3"

$25.00

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 4" 101MM ID/ID

MILD STEEL STRAIGHT EXHAUST DOUBLE COUPLER 4"

$32.00

REDUCER TAPERED CONE - 2.5" (63MM) TO 2" (51MM) X 4" LONG (304 STAINLESS STEEL)

REDUCER TAPERED CONE - 2.5" (63MM) TO 2"

Now $22.50 WAS $25.00

On Sale
REDUCER TAPERED CONE - 3" (76MM) TO 2" (51MM) X 4" LONG (304 STAINLESS STEEL)

REDUCER TAPERED CONE - 3" (76MM) TO 2" (

Now $22.50 WAS $25.00

On Sale
  • 1
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Precision Fit Tapered Cone Exhaust Reducers

When maintaining exhaust gas velocity is paramount, a tapered cone design is the superior choice. Unlike abrupt step reducers that create turbulence, these components provide a gradual transition between different pipe diameters. This smooth pathway helps maintain consistent flow, which is crucial for scavenging exhaust gases effectively from the engine cylinders in a performance application. 

The result is a more efficient system that helps preserve torque and throttle response. These precision-fit cones are engineered for clean welds, creating a strong and permanent seal. Whether you are fitting a larger turbo downpipe or adapting a high-flow muffler, a tapered reducer exhaust pipe delivers a professional-grade solution that supports your vehicle's performance goals.

Heavy-Duty Mild Steel Exhaust Adapters

While optimal flow is key, durability is the foundation of any reliable exhaust system. Our heavy-duty steel adapters are built to withstand the heat, vibrations, and harsh conditions of daily driving and demanding work environments. Constructed from robust mild steel, these reducers offer excellent weldability, making them a favourite among professional fabricators and DIY mechanics alike. 

Their straightforward, stepped design provides a simple and effective way to connect different pipe sizes, from a common 2.5-inch to 2-inch exhaust reducer to larger diameters for trucks and commercial vehicles. This type of exhaust pipe reducer is the go-to for practical repairs and functional upgrades where strength and reliability are the top priorities.

Straight Pipe Couplers for Seamless Connection

Adapting different pipe diameters is a common challenge, but sometimes the task is simply to join two pipes of the same size with unshakable strength. Straight pipe couplers are designed for exactly that. They create a solid, leak-proof bridge between two sections of tubing, perfect for repairing a damaged pipe or extending a system to fit a new component. 

These double couplers allow both pipe ends to slot in securely, providing a solid foundation for welding a permanent connection. Made from the same durable mild steel as our adapters, they offer a dependable solution that restores structural integrity to your exhaust line, getting your vehicle back on the road with a connection you can trust.

Stainless Steel Oval-to-Round Adapters

Custom builds, especially on lowered vehicles, often require creative solutions to maintain ground clearance. Oval exhaust tubing is a popular choice for routing pipes through tight spaces, but it presents a unique connection challenge when it’s time to install a standard round muffler or exhaust tip. Our stainless steel oval-to-round adapters are the perfect solution. 

They provide a smooth and efficient transition from a flattened profile back to a conventional circular shape. Fabricated from high-grade stainless steel, these adapters also offer superior corrosion resistance and a clean, premium look that complements high-end builds. This specialised reducer exhaust pipe is an essential part for any fabricator looking to build a tucked, high-clearance system without compromising flow or finish.

Shop High-Performance Exhaust Pipe Reducers and Adapters Now

Finding the right reducer and adapter is the first step toward a successful custom exhaust project. At Perform-Ex Auto, we stock the components you need to connect parts with confidence and precision. Find what you need, place your order online, and we’ll ship the parts right to your address.

But a powerful and durable exhaust system is more than just pipes - it’s about securing every joint and perfecting every detail. To complete your build or repair properly, explore our full range of exhaust accessories:

  • Bolts, Studs & Nuts
  • Clamps
  • Collectors
  • Exhaust Tips
  • Flange Plates
  • Flat Back Clamps
  • Flex Bellows
  • Gaskets
  • Hangers & Brackets
  • Heat Tape
  • Lap & Butt Clamps
  • Mandrel Bend Exhaust Pipes
  • O2 Sensors & EGT Accessories
  • Paint
  • Rubber Mounts
  • Tube
  • X & Y Pipes

If you need assistance choosing the best products for your vehicle make and model, do not hesitate to contact our team. We’re passionate about cars and are ready to help you find the perfect parts for your project.

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