SKU: 51889799170

GrimmSpeed EQUAL LENGTH HEADER for 2015-2021 Subaru WRX (113008)

Sale price$438.30 Regular price$487.00
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Ships within 48 hours · Estimated delivery Aug 12 - Aug 17

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Description

GrimmSpeed EQUAL LENGTH HEADER for 2015-2021 Subaru WRX (113008)Over the years, GrimmSpeed has proven that our exhaust products are some of the highest quality and best performing in the industry because of the detail oriented approached that we put into their development. When it comes to improving on an OEM design, this attention to detail and overall exhaust knowledge allows us to identify aspects of the factory parts that can be greatly improved upon. One of the first things to note about the OE exhaust

Over the years, GrimmSpeed has proven that our exhaust products are some of the highest-quality and best-performing in the industry because of the detail oriented approached that we put into their development. When it comes to improving on an OEM design, this attention to detail and overall exhaust knowledge allows us to identify aspects of the factory parts that can be greatly improved upon. One of the first things to note about the OE exhaust manifold are the several points where flow is decreased due to a neckdown in piping diameter. These disruptions in exhaust flow result in decreased turbine efficiency which ultimately limits boost and power production. Furthermore, the OE merge collectors are made specifically with ease of manufacturing in mind and the result is a compromise on performance. The collectors contain very odd shapes that are bad for smooth exhaust flow and have several diameter restrictions that make them one of the biggest weaknesses of the stock manifold. Finally, the angle of the exhaust flow merge is also not ideal, causing the exhaust pulses to “fight” each other, which can add to flow differences for the twin scroll turbine, sacrificing spool and performance.

After isolating the inadequacies of the OEM exhaust manifold, we were able to start identifying key areas of improvement: correctly sized and consistent exhaust runners that are more equal length, a consistent and non-bottlenecking merge collector inlet and outlet and a higher angle merge collector to direct flow into the turbine and prevent opposing flow disruptions. Beyond that, we decided on using thicker tubing and flanges for increased durability and longevity to more-effectively support the overhanging turbocharger.

All four of our exhaust runners are designed in conjunction with the merge collector to equal out the lengths as well as the overall bend angles. This is especially important in the FA WRX twin scroll turbine configuration because it makes the strength of each pulse, or “push” on the turbine wheel, at equal timing and consistency.

Since the exhaust runners are CNC bent and trimmed as a single piece there are no additional welds to introduce points of failure or junctions that would interrupt flow, resulting an in impressive difference of less than 1% in total length. In addition, maximum variance is only 5 degrees from the most bent to the least bent runner, this mean we were able to produce what is a truly equal length, and equal bend manifold. The collector being cast, allows for the runner spacing and angles necessary to obtain the equal bends and lengths of all the tubes. This part is a major player in the GrimmSpeed manifold’s ability to fit between the stock skid plate and the oil pan while still providing the ideal performance from the rest of the design. The cast collector also allows for more smooth and consistent flow in the interior compared to a welded variant. This greatly simplifies the overall design, removing five more welded junctions, which could be a point for flow interruption or the structural failure that we see with other headers.


The head flanges of our header are CNC cut and faced from a 1/2in thick piece of 304 stainless steel. This design is much thicker than OEM to increase reliability and longevity, as well as to provide additional material to be removed after welding to ensure flatness from flange to flange. This additional measure allows for greater gasket sealing which results in increased performance. The final touch is that the exhaust runners are welded inside the flange as well as outside, this is an extra step in manufacturing, but it provides a rounded lip to improve flow from the flange through the runner.

All of these things come together to make The GrimmSpeed 15-21 WRX Header not only the prettiest on the market, but also among the best performing and durable pieces you can purchase.

Features:

  • Full 304 Stainless Steel Construction -Flanges, tubing, collector and badge
  • True Equal Length Runners -CNC bent and trimmed, less than 1% variance from the longest to the shortest
  • Innovative Cast Merge Collector -Low restriction inlet and outlet, smooth flow and consistent performance
  • Smooth, Restriction-Free Flow Throughout -Single piece mandrel bent tubing welded to a single piece merge collector removes unwanted steps
  • Thick 1/2in CNC Cut Flanges and 14ga Tubing -Added durability and longevity
  • No Tune Required -Safe to run, just bolt on
  • No Ground Clearance Loss -Clears factory skid platewithout using spacers
  • J-Pipe/Turbo Bracket Included -Retain the support that other aftermarket header lose
  • Gaskets and Hardware Included -Everything you need to get installed and on the road
  • Manufactured and Welded In The USA -For consistency and top quality control
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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: 51889799170

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Ida Silva
San Leandro, US
★★★★★ 4
Works great.
Ordered for husband to use at office. Says it’s working fine.
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Reviewed in the United States on May 15, 2026
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Bruce Belack
Alexandria, US
★★★★★ 5
Asurion gets 5 stars
Asurion tried to repair our printer. And when it was beyond repair they within 24 hours remitted an Amazon gift card enabling us to purchase a new printer we received in 2 days. I highly recommend Asurion.
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Reviewed in the United States on March 9, 2026
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Elliott Brodzinski
Massapequa, US
★★★★★ 5
Better to have then not!
Excellent when you need it! Prompt claim assistance.
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Reviewed in the United States on March 19, 2026
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Derek
Draper, US
★★★★★ 5
Trustworthy
This protection plan is honest and true. I never purchase any electronics without it, not because I don't trust the product, but because anything can happen and ASURION has always come through when I needed them.
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Reviewed in the United States on May 8, 2026
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Nelson Morales Jr,
Lowell, US
★★★★★ 5
excellent insurance and well worth the price
the process was very easy follow the return process return via UPS store very easy to track in about 2 days you will be notified about the decision and if not repairable you will let you know the amount and it will be in your gift car almost immediately great service from starting you claim to end of process
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Reviewed in the United States on May 3, 2026

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