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Header Reducers
Your headers end in one size, and the rest of your exhaust is a different size. Looks like you need some header reducers!
Since lap joints are easier to deal with than...
Your headers end in one size, and the rest of your exhaust is a different size. Looks like you need some header reducers!
Since lap joints are easier to deal with than butt joints, it's ideal to have the outside diameter of the pipe coming off the collectors fit within the inside diameter of the exhaust pipe. Header reducers (sometimes called collector reducers) usually have a flange on one end, to connect to the header, and the other end is made to slip fit into your exhaust system. From there, it's a simple matter to clamp the joint together, or simply weld it.
Summit Racing Equipment makes it easy to find the reducer you...
Your headers end in one size, and the rest of your exhaust is a different size. Looks like you need some header reducers!
Since lap joints are easier to deal with than butt joints, it's ideal to have the outside diameter of the pipe coming off the collectors fit within the inside diameter of the exhaust pipe. Header reducers (sometimes called collector reducers) usually have a flange on one end, to connect to the header, and the other end is made to slip fit into your exhaust system. From there, it's a simple matter to clamp the joint together, or simply weld it.
Summit Racing Equipment makes it easy to find the reducer you need. You can filter the results below by collector diameter, outlet diameter, and even material and finish! If you need an exhaust sensor bung, you can filter those out, too.
If you need to change pipe sizes further downstream, Summit also carries exhaust pipe adapters and reducers to help you assemble the perfect custom system. For more information and advice on exhaust component sizing, check out this article and video on our blog.
Top Brands
Never settle for parts from third-party resellers! You can shop with confidence at Summit Racing Equipment, because we only partner with trusted manufacturers. Choose your header reducers from proven brands like Hedman Hedders, Dynomax Performance, Hooker Headers, Flowmaster, Kooks Headers, Patriot Exhaust, Sanderson Headers, JBA Headers, Pypes Performance, and many more.
Showing In Stock Items. Show All 31 Items.
Header Reducer, with Oxygen Sensor Bung, 3-Bolt Flange, 3 in. Inlet, 3 in. Outlet, Steel, Painted, Each
Part Number: HED-21133
Estimated Ship Date: Today
Estimated Ship Date: Today
BUILD IT WITH SUMMIT!
Summit Racing™ Exhaust Reducers with 2.5 Inch Outlet SUM-626102
Header Reducer, with Oxygen Sensor Bung, 3-Bolt Flange, 3 in. Inlet, 2.5 in. Outlet, Steel, Painted, Each
Part Number: SUM-626102
Estimated Ship Date: Today
Estimated Ship Date: Today
Collector Reducers, 3-Bolt, 3 in. to 2.5 in., O2 Sensor Bungs, Gaskets, Fasteners, Pair
Part Number: PTE-H7233
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, with Oxygen Sensor Bung, 3-Bolt Flange, 3.00 in. Inlet, 3.00 in. Outlet, Stainless Steel, Natural, Each
Part Number: HED-22126
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, with Oxygen Sensor Bung, 3-Bolt Flange, 3 in. Inlet, 2.25 in. Outlet, Steel, Natural, Each
Part Number: HED-21107
Estimated Ship Date: Today
Estimated Ship Date: Today
Collector Reducers, 3-Bolt, 2.50 in. to 2.25 in., O2 Sensor Bungs, Gaskets, Fasteners, Pair
Part Number: PTE-H7232
Not Yet Reviewed
Estimated Ship Date: Apr 27, 2026 if ordered today
Estimated Ship Date: Apr 27, 2026 if ordered today
Header Reducer, with Oxygen Sensor Bung, 3-Bolt Flange, 3 in. Inlet, 3 in. Outlet, Steel, Painted, Each
Part Number: SUM-626101
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, with Oxygen Sensor Bung, 3-Bolt Flange, 2.5 in. Inlet, 2.25 in. Outlet, Steel, Painted, Each
Part Number: SUM-626103
Estimated Ship Date: Today
Estimated Ship Date: Today
Oxygen Sensor Reducer; Tube Size 2.5 in.; Collector Size 3 in.; w/Ball And Socket Flanges; Mild Steel
Part Number: HED-21143
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, Ball/Socket Flange, 3 in. Inlet, 3 in. Outlet, Oxygen Sensor Fitting, Steel, Each
Part Number: HED-21134
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, 3-Bolt Flange, 3.0 in. Inlet, 2.5 in. Outlet, Oxygen Sensor Fitting, Steel, Each
Part Number: HED-21142
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, Ball and Socket Flange, 3 in. Inlet, 2.25 in. Outlet, Steel, Painted, Each
Part Number: HED-21117
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducers, 3-Bolt Flange, 2.5 in. Inlet, 2.25 in. Outlet, O2 Bung, Steel, Natural, Pair
Part Number: BIG-10105FLT
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Header Reducer, 3-Bolt Flange, 2.5 in. Inlet, 2.25 in. Outlet, Oxygen Sensor Fitting, Steel, Each
Part Number: HED-21126
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Starter Tubes, Ball and Socket, 2-Bolt Flange, 409 Stainless Steel, 2.5 in. Diameter, O2 Bungs, Pair
Part Number: JBA-1650-1ST
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Starter Tubes, Ball and Socket, 2-Bolt Flange, 304 Stainless Steel, 2.5 in. Diameter, O2 Bungs, Pair
Part Number: JBA-31650-1ST
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Collector Adapter 3" inlet 3" outlet with O2 bung
Part Number: STW-HCA33-O2
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Header Reducer, Ball/Socket Flange, 3 in. Inlet, 3 in. Outlet, Oxygen Sensor Fitting, Steel, Each
Part Number: SUM-626100
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, Ball/Socket Flange, 3 in. Inlet, 2.5 in. Outlet, Oxygen Sensor Fitting, Steel, Each
Part Number: SUM-626104
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducers, 3-Bolt Flange, 3 in. Inlet, 2.5 in. Outlet, Steel, Natural, Pair
Part Number: BIG-10110FLT
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
Header Reducer, 3-Bolt, 4-Bolt, Universal Flange, 3 in. Inlet, 2.25 in. Outlet, Steel, Natural, Each
Part Number: HED-21108
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducer, Ball and Socket Flange, 2.5 in. Inlet, 2 in. Outlet, Steel, Painted, Each
Part Number: HED-21116
Estimated Ship Date: Today
Estimated Ship Date: Today
Header Reducers, Collector Reducer, 3-bolt Flange, 2.500 in. Diameter, Stainless Steel, Natural, Each
Part Number: STW-HCA2-52-5O2
Estimated Ship Date: Today
Estimated Ship Date: Today
This product may not be eligible for select promotional offers
HEADER COLLECTOR ADAPTER
Part Number: STW-HCA3-52-5O2
Not Yet Reviewed
Estimated Ship Date: Jun 4, 2026 if ordered today
Estimated Ship Date: Jun 4, 2026 if ordered today
This product may not be eligible for select promotional offers
HEADER COLLECTOR ADAPTER
Part Number: STW-HCA3-53-5O2
Not Yet Reviewed
Estimated Ship Date: Jun 4, 2026 if ordered today
Estimated Ship Date: Jun 4, 2026 if ordered today
This product may not be eligible for select promotional offers
