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Just pick the reducer size that matches the diameter of the header collector. Bolt it to the collector ring, and weld on the tailpipe. If you have a header without the collector ring, use Hooker slip-on reducers. They're sized to slip over the collector and weld to the exhaust pipe
This product is in the following categories:
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Headers
Manufacturer:
Hooker Headers
Part #: 11025HKR
Hooker Headers 11025HKR Header Reducers, 3-Bolt Flange, 2.5 in. Inlet, 2 in. Outlet, Steel, Painted, Pair
Part #: 11030HKR
Reducer Collector: Header Reducers, 3-Bolt Flange, 3 in. Inlet, 2.125 in. Outlet, Steel, Painted, Pair
Part #: 11032HKR
Reducer Collector: 3' Tailpipe: 3' this is a Bolt on Collector
Part #: 11035HKR
Header Reducers 3 Bolt Flange - 3.5" Inlet, 2.5" Outlet
Part #: 11040HKR
Header Reducers 2" Tailpipe 2 1/2" - Bolt on Collector