SKU: 2773920811

DC Sports K Swap 4-2-1 Header

Sale price$256.50 Regular price$285.00
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Description

DC Sports K Swap 4-2-1 HeaderIntroducing the DC Sports K Swap 4 2 1 Header. This header is designed not only to address common K swap installation challenges but also to deliver usable power gains. With its one piece 304 stainless design, CNC machined flanges, and equal length Tri Y layout, it ensures optimal exhaust flow and performance. Optimized Tri Y 4 2 1 Design Compatible with K20 and K24 Swaps Fits 92 00 Civic, 94 01 Integra, & 93 97 Del Sol Works with Hasport or

Introducing the DC Sports K-Swap 4-2-1 Header. This header is designed not only to address common K-swap installation challenges but also to deliver usable power gains. With its one-piece 304 stainless design, CNC-machined flanges, and equal-length Tri-Y layout, it ensures optimal exhaust flow and performance.

  • Optimized Tri-Y 4-2-1 Design

  • Compatible with K20 and K24 Swaps

  • Fits 92-00 Civic, 94-01 Integra, & 93-97 Del Sol

  • Works with Hasport or Innovative Mounts

VEHICLE FITMENT AND COMPATIBILITY

Engineered to fit 1992-2000 Honda Civics, 1993-1997 Honda Del Sol, and 1994-2001 Acura Integras, this header is compatible with both K20 and K24 engine swaps using Hasport or Innovative mount kits. Hasport mounts accommodate two height positions, while the header works perfectly in both. For Innovative mounts with forward and back positions, the header optimizes performance in the most forward configuration. See the fitment section below for exact fitments. 

HEADER DESIGN AND PULSE TIMING

The equal-length 4-2-1 layout mirrors Honda's original engine design, pairing cylinders 1-4 and 2-3 to match the 1-3-4-2 firing order. This configuration maintains consistent 360-degree spacing across the 720-degree cycle, allowing the low-pressure wave from one cylinder to reach the next during overlap. The result is enhanced scavenging, reduced exhaust reversion, and a more consistent torque curve.

At the head, DC precisely opened the flange ports to match the PRC Type R oval profile. The 304 stainless steel head flange starts as a 1/2-inch plate and is CNC-machined down to 3/8 inches in low-stress areas to reduce weight while maintaining flatness and rigidity. Strategically reinforced zones remain at 1/2 inch to prevent warping and ensure a tight seal.

RUNNERS, WELDS, AND COLLECTOR GEOMETRY

Each primary runner is precision mandrel-bent from 304 stainless steel, featuring a 1.5-millimeter wall thickness. The runners are flared to match the PRC oval port shape and seated approximately one-quarter inch into the CNC-machined flange. DC implemented full internal and external flange welds to maximize penetration, ensure optimal sealing, and minimize potential cracking during repeated heat cycles.

The runner sizing follows a carefully calculated stepped design to balance velocity and flow:

  • Primaries start at 48mm
  • Step to 50.8mm
  • Merge at roughly 15 degrees into 54mm secondaries
  • Finish with a 7-degree transition into a 63.5mm 2.5-inch collector

Each dimensional and angular specification is precisely calculated to optimize exhaust scavenging and overall system efficiency. 

OUTLET LOCATION AND O2 SENSOR PLACEMENT

The outlet is positioned near the tunnel centerline, taking into consideration common K swap shifters and cables. Routing is planned so everything fits without subframe hammering or complicated mid pipes, and the header lands where it should while preserving ground clearance for lowered cars. A 2.5-inch stainless flex bellow between the header and collector absorbs engine movement and protects the welds, and allows you to easily weld it up to your exhaust of choice with the included two-bolt flange that comes in the box. 
Lastly, many swap headers install a single O2 bung in a position that places the end of the O2 sensor where it can rub against the floorpan. DC includes two oxygen sensor bungs and position them to clear the chassis and protect wiring. This allows you to run both the OEM primary and secondary sensors, or you can plug the second port and use it for quick wideband access at the dyno. The goal is simple: remove installation issues for a clean and easy install.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 2773920811

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★★★★★ 5
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Size: 3X-Large, Color: Duffle Bag Green
I bought this sweat shirt for my husband, and had to buy him another because I love it so much!! My children have tried to take it from me several times. It is so soft, super thick, and warm. I love the fit, it is a little baggie just how I like them. The quality is great for the money, at this price sweat shirts are usually see through and bad quality but NOT this one!!!!
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Reviewed in the United States on February 5, 2026
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Juan
West Palm Beach, US
★★★★★ 5
Cool
Size: Small, Color: Warm Mocha
A sweater is the ultimate clothing item for staying warm and cozy. Whether it's a chilly winter day or a cool summer evening, a sweater is there to provide comfort and protection. Its soft and knitted fabric feels gentle against the skin, making it a pleasure to wear. One of the greatest advantages of a sweater is its versatility. It can be dressed up or down, depending on the occasion. Pair it with jeans for a casual look, or wear it over a dress for a more elegant ensemble. With so many colors, patterns, and styles to choose from, there's a sweater for every taste and preference. Not only does a sweater keep you warm, but it also adds a touch of style to your outfit. From chunky cable-knit sweaters to sleek and form-fitting designs, there's a wide range of options to suit any fashion sense. Sweaters can be accessorized with scarves, hats, and jewelry to create a unique and personalized look. Another benefit of a sweater is its durability. Well-made sweaters are built to last, making them a wise investment in your wardrobe. With proper care, a sweater can withstand years of wear and still maintain its shape and quality. In addition to its practicality and style, a sweater also holds sentimental value. It can remind us of cherished memories, like cozy evenings by the fireplace or family gatherings during the holidays. Wearing a favorite sweater can evoke feelings of comfort, nostalgia, and a sense of belonging. In conclusion, a sweater is the optimal choice for both fashion and function. It keeps us warm, adds a stylish touch to our outfits, and holds sentimental value. So, next time you're getting dressed, don't forget to reach for that trusty sweater! Stay cozy, my friend! 😊🧥
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Reviewed in the United States on December 30, 2023
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J24KT
Port Orchard, US
★★★★★ 4
Super Soft and Cozy Hoodies
Size: X-Large, Color: Black Heather Pullover, Size: X-Large, Color: Black Heather Pullover
Product: Eversoft Fleece Hoodie Brand: Fruit of the Loom Positives: Super soft and cozy. Light weight and really warm. Easy to pull over. The material is quality and for the cost is an extremely great value. There is an assortment of colors to choose from. Hoodies to go with everything. I am super happy with my purchase and the deal that I got. Negatives: Not super thick, but also fluff up a little after the first wash. Overall Impression: The hoodies look great and are a super good value. I use them daily and recommend them to anyone looking for a good hoodie that doesn’t cost a fortune. There are plenty of colors to choose from, to wear with anything for any occasion, at anytime.
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