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GMG WC-EVO Long Tube Headers

$6,995.00

Description

  Engineered and developed on the track, the EVO-lution of our WC Series long-tube header system boasts huge mid-range torque and hp gains. No ECU reprogramming is required and the vehicle will not throw any check engine lights.

This header incorporates German-made HJS 200-Cell Metal-Matrix Sport Catalytic Converters. While being extremely high flowing, these catalysts clean up the sound of the engine and get rid of unwanted drone. HJS manufacturers the finest Catalytic Converters on the market today and also responsible for producing most OEM sports car catalysts.

Innovative Design - While the header features a Long-Tube equal-length design, it is still modular with the rest of the factory exhaust system. 3D scan technology and data is used to guarantee perfect fitment and measure the volume of each individual header tube or "runner". 

Fabrication - Each header is fabricated right here in Southern California.  We use only the highest quality US-produced stainless steel tuning and laser-cut flanges.  Each joint is TIG welded and precisely normalized.  The finished header features an exceptional finish and is peerless in its quality and durability.

Highlights:
  • No ECU reprogramming needed and no check engine lights
  • Sport button remains fully functional
  • Equal length runners
  • True 3-into-1 F1-style merge collector
  • German made high-flow 200 cell HJS HD catalytic converters
  • Increase horsepower and torque throughout rev range
  • TIG welded using US Made T304 stainless tubing
  • CNC machined extra-thick flanges to prevent warping
  • Direct bolt on replacement, with NO modification to the rear diffuser needed.

Vehicle Fitment: 

  • 2017-current Porsche 991.2 GT3/RS
  • 2014-2016 Porsche 991.1 GT3/RS
  • 2016 Porsche 911 R

**Installation is available at our Southern California location, or at any of our world-wide network of authorized dealers.  This system is not CA SMOG legal and therefore intended for off-road use only.

Details

Each piece in our collection is crafted with intention—balancing timeless design with modern responsibility. We use only high-quality, ethically sourced materials, working closely with skilled artisans who bring every detail to life with care and precision.

Our commitment to sustainability extends from recycled precious metals to responsible stone sourcing and mindful production practices. Whether it's a gift or a personal keepsake, your jewelry is made to last—and made to matter.

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GMG WC-EVO Long Tube Headers

$6,995.00
Shipping & Returns

International Shipping

In-stock orders leave the shop within two to three business days. We try to keep everything on the shelf, but there are stretches where we're backordered, and when that happens a team member will contact you with an accurate ship date before you have to ask for one. Hawaii, Alaska, Puerto Rico and international destinations run higher than domestic, and because the rate depends on where you are, contact us for a proper quote before you order.

Order tracking

Tracking numbers go out automatically as soon as your order is packed. If 72 hours have passed without one, check your junk folder, which is where these emails tend to end up, and if it isn't there either, contact us and we'll find it.

Get in touch

If you have a question about your order, contact us and a person at the shop will answer it. Customer service runs Monday through Friday, 8am to 5pm PST.

Sourcing & Materials

Sourcing

We are particular about what things are made from, which is why we build with Docol R8 tubing rather than whatever the steel yard had that week, and why our merge collectors are now 3D printed instead of fabricated the way everyone else still does it, because the printed part does the job better and the old way was leaving something on the table. None of it is done to look clever. It's done because the material that survives a season at the track is rarely the material that was easiest to order, and we'd rather go find the unorthodox thing than sell you the convenient one.

made here

Every GMG part is produced in Southern California by our own engineers and fabricators, and the process runs the whole way through the building: the 3D scan of the car, the engineering and post-processing, the first prototype, and the beating that prototype takes at the hands of our professional drivers and the crew who support them before anyone is allowed to call it a product. Every name in that chain is one we know. The partners whose products we list are held to the same expectation, because putting our name next to something means we're accountable for it, and we'd rather do without a listing than explain one away.

why it's on the shelf

Our home track is a short walk from the shop door, which means every harness bar, exhaust and performance part we sell has been run in anger under real conditions on our own cars before it goes on yours, and the ones that didn't hold up never made it to this page. That is the entire value system, and it comes from a lot of hours in competitive racing, where a failed part is a wrecked car rather than a bad review. We don't sell vanity upgrades. If a part is listed here it changes something you can measure or feel, or it makes the car safer, and if it does neither we have no interest in taking your money for it.

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