DC Sports K Swap 4-2-1 Header
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
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 2773920811

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Honest Dad Review
Lowell, US
★★★★★ 5
Perfect Size and Gentle Enough for Small Dogs, Makes Brushing Way Easier
Color: Macrobrush Kit, Color: Macrobrush Kit
This toothbrush ended up being a great fit for my small 8 lb dog. The head is small enough that I can actually reach both the outside and inside of her teeth without feeling like I’m poking around with something too big or awkward. That alone makes a huge difference because most dog toothbrushes feel oversized for small mouths. The bristles are soft and gentle, which my dog seems to tolerate well. She doesn’t fight me when I brush, and that’s saying a lot because she usually has zero patience for grooming stuff. The 360-degree design helps too, since it cleans more surface area with each pass instead of needing to angle the brush a million different ways. It’s easy to hold and doesn’t feel flimsy, and I like that I can get a decent clean done pretty quickly without turning it into a wrestling match. If you have a small dog and struggle to find a toothbrush that actually fits their mouth comfortably, this one is definitely worth trying. It’s made brushing less stressful for both of us, which is really all I can ask for.
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Reviewed in the United States on January 17, 2026
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Oli L
Bozeman, US
★★★★★ 4
Good Brush but be Careful
Color: Macrobrush Kit
Works better than most dog toothbrushes I've tried. My dog broke the brush head on one, so you have to be careful.
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Reviewed in the United States on August 6, 2025
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Shaun Murphy
Omaha, US
★★★★★ 5
My puppies love this toothpaste and toothbrush
Color: Macrobrush Kit, Color: Macrobrush Kit
So easy to use! My boston terriers love having their teeth brushed with this 360° toothbrush and they love the taste of this toothpaste. When I get it out they come running, no resistance at all. This is soft enough for my teething puppy and seems to feel good on their gums and teeth coming in. The brush is small and perfect for 16lb puppies mouth and teeth. Have been using this for almost a year and it is definitely been worth the price for a slightly angled and made well. Im confident that their for puppies!
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Reviewed in the United States on May 5, 2026
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Teacher Deb
Port Orchard, US
★★★★★ 5
A Great Doggie Toothbrush
Color: Macrobrush Kit
Does the job! Small, but working very well for our lab/golden mix dog. Holding up well, too!!
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Reviewed in the United States on May 10, 2026
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tracy
Waukegan, US
★★★★★ 2
Didn’t care for it
Color: Macrobrush Kit
I really didn’t care for this. The brush is small and the bristles too short. I much prefer a regular toothbrush
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Reviewed in the United States on January 8, 2026

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