Exhaust Adapters & Fittings

Flowmaster Performance Exhaust R3025 Venturi Reducer Cone 3" ID 2.5" OD

Forms smooth transitions from one pipe diameter size to another. Available in various sizes.

4" Diesel / Race Exhaust Coupler / Adapter - ID to ID Connector

Upgrade your exhaust system with this high-quality AP Exhaust 14603 Exhaust Pipe Connector designed to provide a reliable, straight-through link between two matching 4-inch diameter pipes. Constructed from aluminized steel for excellent corrosion...

5" ID to 4" OD Diesel / Race Exhaust Reducer / Adapter / Coupler

Upgrade or adapt your exhaust system with the AP Exhaust 8965 reducer coupler, designed to connect 5 inch outside diameter exhaust tubing to 4 inch inside diameter tubing. This coupler features a 5 inch inside diameter on one end to slip over 5 inch OD...

4" OD to 3.5" ID Diesel / Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 9332 reducer coupler is designed to connect a 4 inch exhaust component to a 3.5 inch exhaust pipe. One end of this coupler is 4 inch outside diameter, which is made to slip into a 4 inch inside diameter pipe, muffler, or other exhaust...

4" ID to 4" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 8991 connector is designed to make it easy to join two 4 inch exhaust pipes when one connection needs to slide over a pipe and the other needs to slide into a pipe. One end of this connector is 4 inch inside diameter, which slips over a 4...

3.5" ID to 3.5" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 8976 connector is designed to make it easy to join two 3.5 inch exhaust pipes when one connection needs to slide over a pipe and the other needs to slide into a pipe. One end of this connector is 3.5 inch inside diameter, which slips over...

3" ID to 3" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 8975 connector is designed to make it easy to join two 3 inch exhaust pipes when one connection needs to slide over a pipe and the other needs to slide into a pipe. One end of this connector is 3 inch inside diameter, which slips over a 3...

3.5" OD to 3" ID Diesel / Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 9333 reducer coupler is designed to connect a 3.5 inch exhaust component to a 3 inch exhaust pipe. One end of this coupler is 3.5 inch outside diameter, which is made to slip into a 3.5 inch inside diameter pipe, muffler, or other exhaust...

6" ID to 5" ID Diesel / Race Exhaust Reducer / Adapter / Coupler

Upgrade or adapt your exhaust system with the AP Exhaust 9335 reducer coupler, designed to connect 6 inch outside diameter exhaust tubing to 5 inch outside diameter tubing. This reducer features a 6 inch inside diameter on one end and a 5 inch inside...

3" OD to 2.5" ID Diesel / Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 9600 reducer coupler is designed to connect a 3 inch exhaust component to a 2.5 inch exhaust pipe. One end of this coupler is 3 inch outside diameter, which is made to slip into a 3 inch inside diameter pipe, muffler, or other exhaust...

4" OD to 3" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 9648 reducer coupler is designed to step down between two different size ID connections by using outside diameter ends. This coupler is 4 inch OD on one end and 3 inch OD on the other end, which means both ends are made to slip into...

4" Diesel / Race Exhaust Coupler / Adapter - OD to OD Connector

Upgrade or repair your exhaust system with the AP Exhaust 8972 exhaust connector, designed to join two sections of 4 inch inside diameter exhaust tubing. This connector features a 4 inch outside diameter on both ends, allowing it to slip inside 4 inch...

4" ID to 3.5" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

Upgrade or adapt your exhaust system with the AP Exhaust 8964 reducer coupler, designed to connect 4 inch outside diameter exhaust tubing to 3.5 inch inside diameter tubing. This coupler features a 4 inch inside diameter on one end to slip over 4 inch OD...

4" ID to 3" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

Upgrade or adapt your exhaust system with the AP Exhaust 8963 reducer coupler, designed to connect 4 inch outside diameter exhaust tubing to 3 inch inside diameter tubing. This coupler features a 4 inch inside diameter on one end to slip over 4 inch OD...

3.5" ID to 3" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

Upgrade or adapt your exhaust system with the AP Exhaust 8962 reducer coupler, designed to connect 3.5 inch outside diameter exhaust tubing to 3 inch inside diameter tubing. This coupler features a 3.5 inch inside diameter on one end to slip over 3.5...

6" OD to 4" OD Diesel/Race Exhaust Reducer / Adapter / Coupler

The AP Exhaust 9720 reducer coupler is designed to step down between two different size ID connections by using outside diameter ends. This coupler is 6 inch OD on one end and 4 inch OD on the other end, which means both ends are made to slip into...