K-Tuned 4-2-1 Stainless Steel Swap Race Header

K-Tuned 4-2-1 Stainless Steel Swap Race Header
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    Will It Fit Your Vehicle?

    Fitment Notes: K20 and K24 in EG, DC2, EK (Hasport EKK1 and EKK2 mounts are both OK)


    The popular K-Tuned 4-2-1 Swap Header for K-series engine swaps is back again with some improvements. This header is capable of making very good power on relatively stock or mild engine setups. The main focus while designing our K-Tuned Swap Header was to blend excellent fitment, high quality construction and keep the price reasonable. We have upsized the primary piping slightly and improved the quality of all transitions to improve exhaust flow. The primary to secondary transition now uses an expanded secondary pipe at the joint to eliminate any restriction. The secondary pipes have also been changed a little and now merge together better at the collector. The header is constructed with 100% stainless steel with 3/8' thick flanges that are double welded and then ported for optimum flow. The piping is extra thick for added strength and to allow better weld penetration. These strength features add longevity and make a header that will be able to take the abuse of a firmly mounted K-swap engine. The strong interlocking flex-pipe can handle a lot of heat and has a 2.5' ID (Inside diameter). It flows very well and absorbs engine movement. Like our other headers, they are designed to fit most K-swap chassis perfectly. The header does not interfere with shifter mounting kits and is well centered in the exhaust tunnel. The 3-bolt exit flange prevents leaks and allows for installation to the existing exhaust piping with minimal modification. Please note that all of our headers will require some exhaust welding for installation.

    Key Features:

    • Full stainless steel construction
    • 100% Tig welded
    • CNC cut flanges
    • 2.5' High Quality Flex
    • 2.5' Oulet Flange
    • Fits most K-swap chassis
    • 2 x O2 sensor bungs


    • Part Number: KBH-421-501
    • Manufacturer: K-Tuned

    Vehicle Fitment

    • K20 and K24 in EG, DC2, EK (Hasport EKK1 and EKK2 mounts are both OK)
    Acura Integra
    1994 Acura Integra Coupe
    1995 Acura Integra Coupe
    1996 Acura Integra Coupe
    1997 Acura Integra Coupe
    1998 Acura Integra Coupe
    1999 Acura Integra Coupe
    2000 Acura Integra Coupe
    2001 Acura Integra Coupe
    1994 Acura Integra Sedan
    1995 Acura Integra Sedan
    1996 Acura Integra Sedan
    1997 Acura Integra Sedan
    1998 Acura Integra Sedan
    1999 Acura Integra Sedan
    2000 Acura Integra Sedan
    2001 Acura Integra Sedan
    Honda Civic
    1992 Honda Civic Hatchback
    1993 Honda Civic Hatchback
    1994 Honda Civic Hatchback
    1995 Honda Civic Hatchback
    1992 Honda Civic Coupe
    1993 Honda Civic Coupe
    1994 Honda Civic Coupe
    1995 Honda Civic Coupe
    1992 Honda Civic Sedan
    1993 Honda Civic Sedan
    1994 Honda Civic Sedan
    1995 Honda Civic Sedan
    1996 Honda Civic Hatchback
    1997 Honda Civic Hatchback
    1998 Honda Civic Hatchback
    1999 Honda Civic Hatchback
    2000 Honda Civic Hatchback
    1996 Honda Civic Coupe
    1997 Honda Civic Coupe
    1998 Honda Civic Coupe
    1999 Honda Civic Coupe
    2000 Honda Civic Coupe
    1996 Honda Civic Sedan
    1997 Honda Civic Sedan
    1998 Honda Civic Sedan
    1999 Honda Civic Sedan
    2000 Honda Civic Sedan

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