Extreme Turbo Systems

ETS Subaru STI V2 MaxFlow Header

  • Black Friday Sale!
  • $1,315.60
  • Regular price $1,495.00

SKU: 200-10-EXM-201

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The wait is over! Extreme Turbo Systems is proud to release our new Subaru STI V2 MaxFlow Exhaust Header for the 2004+ Subaru STI.

We designed our ETS V2 MaxFlow Header to be a direct factory replacement header. We start off with large 1 7/8 primary runners that come together in a true low angle 4-1 merge collector that then flow into a huge 2.5" secondary for maximum scavenging and exhaust flow.


  • 1 7/8" primary runners with 2 1/2" secondary for maximum flow.
  • CNC mandrel bent runners.
  • Custom .100 USA made thick wall tubing for durability.
  • Low angle 4-1 merge collector for maximum flow and exhaust scavenging.
  • Slip fit connection for ease of removal and installation.
  • 2-bolt or Vband up pipe flange options.
  • Stock replacement design.
  • Low profile design for maximum clearance.
  • Surfaced flanges for a leak free seal.
  • 304 Stainless steel construction.
  • 100% built in house and made in the USA.

Check out this awesome video by Dustin Williams.

Customer Reviews

Based on 19 reviews
Yoandi Prado
Best subaru header you will ever need.

Looks and feels very well build with heavy duty materials, the vband up pipe set up is amazing and easy to connect. Shout out to everyone at extreme turbo systems!


As usual ETS crushes with their product. We’re expecting to make additional WHP on less PSI with these headers…and the quality is far superior to any other. Look no further than these headers

Ahmed Alremeithi

Worth every cent I pay for it

Donald Schick

Header is perfect! Fit great! There was no struggle trying to push it together or pull it apart to get it over the studs. It looks great and has burned in to a really cool color! Thanks ETS!

Beautiful piece, beautiful performance

The overall quality is great. All welds are perfect. Love how beefy the design on this is. For sure bigger than the competitors and just looks amazing under there. As for performance it is also great. 500whp on blouch 2.5xtr in combo with ewg uppipe GS DP and all supporting.

Bryan Hernandez
Best header out there

Love the sound and the increase of power



Ask a Question
  • Will these fit a 2002 WRX with a EJ257?

    Yes, this manifold should be bolt on compatible with the EJ205, EJ255, and EJ257 engines.

  • Will these headers fit around an IAG extended oil pan?

    Yes! We have an IAG pan here in house that we can use for mockup. If you order one, please include that it will be used with an IAG pan in the order notes.

  • Are these unequal length?

    The header is *nearly* equal length, but not perfectly symmetrical. It still provides a small amount of chop at idle, will have significantly less "Subaru Rumble" since it is no longer a true UEL manifold.

  • For those of us that daily drive their car (including often sloppy winter conditions): Can I still use the OE splash guard/undertray with these headers?

    This manifold fits under the car in the same way that the OEM one does, the undertray goes on just like stock.

  • Do you need a tune after installing the header?

    A tune is not *required* to run this header, but you will not see the full benefit without adjusting the tune. 

    See this post from Prime Motoring for more information - https://www.instagram.com/p/CRmnG-7Ai7K/

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