Reducer Couplers

When a turbo outlet, an intercooler inlet and a throttle body are all different sizes, a silicone reducer coupler joins them without a welded transition. This collection covers the Vibrant Performance straight reducer couplers in inside diameters from 1.5 inches to 4.5 inches, in black and blue.

How reducers are sized

Each reducer lists two inside diameters, one for each end, such as 3.00 inch to 2.50 inch. Match each end to the outside diameter of the pipe it slides over. A smooth taper between the ends keeps airflow from tumbling at the step.

Where they are used

Reducers are common between a compressor outlet and a charge pipe, between a charge pipe and a smaller throttle body, and on intake tubes where a filter or MAF housing differs in size from the tube.

Built for boost

Multi-ply reinforced silicone keeps the reducer from ballooning under pressure and stands up to engine bay heat. Pair it with T-bolt clamps and beaded pipe ends on any boosted joint.

Common questions

How big a step can a reducer handle? A half inch to one inch step is common. Larger steps are better handled with a longer reducer or a welded cone so the airflow stays smooth.

Can I use a reducer on coolant hose? Yes. Silicone reducers work well on coolant lines where two hose sizes meet.

What clamps should I use? T-bolt clamps for boost, and constant tension or T-bolt clamps for coolant.

What's in This Collection

  • 51 products from Vibrant Performance, priced from $16.14 to $62.99
  • Sizes from 1" to 6"
  • Finishes: Black and Blue
  • Free shipping on orders over $150

How to Choose

Measure the outside diameter of the pipes you are joining and choose a coupler with a matching inside diameter. Straight couplers join two pipes in line, elbows turn the path, hump hoses absorb engine movement and reducers join two different sizes. Reinforced silicone holds its shape under boost and heat where rubber hose would balloon or crack.

More Questions

What clamps should I use with silicone couplers?

T-bolt clamps give the most even clamping force and are the best choice on boosted joints. Bead the pipe ends so the coupler cannot blow off.

Can silicone couplers be used on coolant lines?

Silicone works well with coolant, but check the inside diameter and temperature needs for your application.

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