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Mr. Gasket

Mr. Gasket Header Reducer Kit - 3 Inch To 2-1/2 Inch

One Pair, 3-Bolt 3 Inch to 2.5 Inch pipe. Kit includes gaskets and all hardware needed for installation.

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Ideal for connecting headers with a 3-bolt 3.0 inch flange to your 2-1/2 inch exhaust system.


  • Adapts 3.0" 3-Bolt Header Flange to 2-1/2" Exhaust
  • Complete Collector/Reducer Kit w/Reducers, Flanges, Gaskets & Hardware
  • Heavy Gauge Collector Ring
  • Grade 5 Bolts w/ Lock Nuts
  • Retail Packaging

About Mr. Gasket

Using his own '57 Chevy as a rolling testbed, drag racer Joe Hrudka launched the most famous gasket company in the world more than half a century ago. Mr. Gasket is the go-to gasket source for racers with gaskets and fasteners that seal perfectly every time.

Brand Mr. Gasket
Emission Code5
Flange Size3 inch
Product TypeHeader Reducer
Type of ComponentHeader Reducer
WarrantyLimited 90 Day
Part Number5405

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Limited 90 Day: See Details

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    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.