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.
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  • 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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 2773920811

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4.0 ★★★★★
Based on 11 reviews
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Sarah
Grantham, US
★★★★★ 5
Bully approved
If he wants something to gnaw on he will sit with it but he doesn't really play with it. Which is probably the point. It's lasted. The ends are the most chewed. Overall great for a chewer!
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Reviewed in the United States on June 10, 2026
K
Verified Purchase
KenH
Natrona Heights, US
★★★★★ 5
Surprisingly Durable
Color: Green
Our dog is an aggressive chewer. She has destroyed other toys meant for "aggressive chewers" in less that 6 hours. This toy has lasted 17 days and it's still going. It does have areas were the seam has given way and a very small amount of stuffing has come out. She has "killed" the squeaker. But the toy is still usable. We just played Tug of War this morning. It will not last forever. It is showing it's "age". But the durability is there. I am ordering more.
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Reviewed in the United States on March 18, 2026
M
Verified Purchase
Matt
Bozeman, US
★★★★★ 4
Okay for the money
Color: Green
Kind of durable. My dog loved it tho. Lots of tugs. But also lot of stuffing everywhere
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Reviewed in the United States on May 24, 2026
B
Verified Purchase
Barbara Herges
San Leandro, US
★★★★★ 3
Durability and lasting period of toy.
Color: Green
I got this toy for our bulldog. He had a hole in it, which will only progress, within minutes. I took it away until I could find out if there is any kind of warranty. The information says this toy is not for aggressive chewers, yet right in the description and the photo of the toy (that way I knew I was looking at the correct toy), it says for the "aggressive chewer". I am disappointed that even though it isn't how they described, it only lasted minutes before there was damage. Not sure if I would buy another product.
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Reviewed in the United States on December 28, 2025
L
Verified Purchase
LaJune
Massapequa, US
★★★★★ 5
Excellent toy for active dogs! Five ⭐️
Color: Green
⭐⭐⭐⭐⭐ Excellent Toy for Active Dogs! This is my second time purchasing this toy, and it absolutely deserves five stars. My youngest dog, Captain, is a very active 3-year-old with more energy than I can keep up with. He loves being able to sink his teeth into this squeaky toy, and it helps keep him mentally stimulated and entertained. What I love most is that he also shares it with his older brother, Kane. They use it for tug-of-war, which helps burn off some of Captain’s endless energy and keeps both dogs engaged. It does a great job reducing boredom, especially for highly active dogs. The first one lasted several months before needing replacement, which is impressive considering how much it was used. If you have energetic dogs that need something durable and fun, I highly recommend this toy!
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Reviewed in the United States on May 31, 2026

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