Do the SOUL Long Tube Street Headers for 981 fit my Boxster Spyder or Cayman GT4?

Yes. These headers fit the 981 Porsche Boxster Spyder and Cayman GT4 from 2015 to 2016, and the Cayman GT4 Clubsport from 2016, all with the 3.8L flat-six. SOUL sized the runners, collectors, and catalysts specifically for the 981 platform, so they are a direct bolt-on designed to fit without cutting or fabrication.

How much power do they add?

On a Dyno Dynamics dynamometer, the full setup gained roughly 30 whp with a supporting tune, and the Long Tube Street Headers for 981 contributed about 12 whp on their own after the car was tuned. Actual numbers depend on your tune and the rest of your exhaust, but the long-tube design is what makes the larger gains possible.

No, a tune is not required and the headers run with no check engine light. Many owners add a supporting tune to unlock the full gains, since the headers contribute about 12 whp after tuning and the complete package reached around 30 whp on the dyno. The headers improve throttle response and tone on the stock map alone.

How do they change the sound?

The long-tube design sharpens the 3.8L flat-six tone and adds depth, especially higher in the rev range, while keeping unwanted resonance in check. The final character depends on the rest of your exhaust system. Paired with a SOUL cat-back, the headers help deliver the aggressive, high-revving voice the GT4 and Boxster Spyder are known for.

What are the headers made from?

They are built from T304L stainless steel with port-matched flanges, smooth-radius primary tubing, and flow-optimized collectors, hand-assembled and quality-checked in SOUL's shop. The 2-inch runners feed large-diameter high-flow Sport Cats sized for sustained high-RPM use. Every set is fixture-tested for fitment and carries SOUL's lifetime warranty to the original owner for street and track use.

Are these street legal?

The headers are not CARB certified, so they are sold for off-road or competition use and are not legal for sale or use on pollution-controlled vehicles in California or other CARB states. They retain high-flow catalytic converters and run without a check engine light, but emissions legality depends on your state, so check your local rules before installing.

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Description

SOUL Performance Long Tube Street Headers for 981 Porsche Boxster Spyder and Cayman GT4

SOUL Performance’s Long Tube Street Headers for 981 Porsche Boxster Spyder and Cayman GT4 free up the 3.8L flat-six without trading away street manners or throwing a check engine light. Built around large-diameter, high-flow Sport Cats and 2-inch long-tube runners, they sharpen throttle response and deepen the flat-six voice while keeping the car civil enough to drive every day. SOUL hand-assembles each set in Willow Grove, Pennsylvania from T304L stainless steel, with port-matched flanges, smooth-radius primary tubing, and collectors sized specifically for the 981 at high RPM. On a Dyno Dynamics dynamometer, the full setup returned roughly 30 whp with a supporting tune, with 12 whp coming from the headers alone once the car was tuned. Every set is fixture-tested for fitment and backed by SOUL’s lifetime warranty to the original owner, a serious piece of hardware for a serious driver’s car.

Development

SOUL sized the runners, collectors, and catalysts specifically for the 981 platform and its 3.8L flat-six, with particular attention to sustained high-RPM use. On a Dyno Dynamics dynamometer, third-party testing recorded roughly 30 whp of gain with a supporting tune, of which 12 whp came from the headers alone after the tune was applied (gains vary with the rest of the setup). The long-tube design is the foundation that makes the larger numbers possible.

Construction

Each set is built from T304L stainless steel with port-matched flanges, smooth-radius primary tubing, and flow-optimized collectors, then hand-assembled and quality-checked in SOUL’s own shop. The 2-inch long-tube runners feed large-diameter high-flow Sport Cats sized to survive sustained track temperatures while keeping the check engine light off. Every unit is fixture-tested for correct fitment before it ships.

Bolt On and Go

The headers install as a direct bolt-on with instructions included, and SOUL backs fitment with a guarantee. An OEM header gasket can be added to the order so you have a fresh seal on hand for the install.

Features

Long-tube design with large-diameter high-flow Sport Cats
2-inch primary runners with collectors matched to the 3.8L flat-six
Up to roughly 30 whp with a supporting tune, 12 whp from the headers alone after tuning
Sharper throttle response and a deeper flat-six tone, no check engine light
T304L stainless steel with port-matched flanges and smooth-radius tubing
Catalysts and collectors sized for sustained high-RPM use
Fixture-tested for fitment, hand-assembled and quality-checked
Direct bolt-on with instructions included
Optional OEM header gasket available as an add-on
SOUL lifetime warranty to the original owner

Applications

Porsche Boxster Spyder: 981 | 2015-2016 | 3.8L F6
Porsche Cayman GT4: 981 | 2015-2016 | 3.8L F6
Porsche Cayman GT4 Clubsport: 981 | 2016 | 3.8L F6

Notes

This product is not CARB certified and may not be legal for use on emissions controlled vehicles, intended for off road use only

Frequently Asked Questions

Do the SOUL Long Tube Street Headers for 981 fit my Boxster Spyder or Cayman GT4? Yes. These headers fit the 981 Porsche Boxster Spyder and Cayman GT4 from 2015 to 2016, and the Cayman GT4 Clubsport from 2016, all with the 3.8L flat-six. SOUL sized the runners, collectors, and catalysts specifically for the 981 platform, so they are a direct bolt-on designed to fit without cutting or fabrication.
How much power do they add? On a Dyno Dynamics dynamometer, the full setup gained roughly 30 whp with a supporting tune, and the Long Tube Street Headers for 981 contributed about 12 whp on their own after the car was tuned. Actual numbers depend on your tune and the rest of your exhaust, but the long-tube design is what makes the larger gains possible.
Do I need a tune? No, a tune is not required and the headers run with no check engine light. Many owners add a supporting tune to unlock the full gains, since the headers contribute about 12 whp after tuning and the complete package reached around 30 whp on the dyno. The headers improve throttle response and tone on the stock map alone.
How do they change the sound? The long-tube design sharpens the 3.8L flat-six tone and adds depth, especially higher in the rev range, while keeping unwanted resonance in check. The final character depends on the rest of your exhaust system. Paired with a SOUL cat-back, the headers help deliver the aggressive, high-revving voice the GT4 and Boxster Spyder are known for.
What are the headers made from? They are built from T304L stainless steel with port-matched flanges, smooth-radius primary tubing, and flow-optimized collectors, hand-assembled and quality-checked in SOUL’s shop. The 2-inch runners feed large-diameter high-flow Sport Cats sized for sustained high-RPM use. Every set is fixture-tested for fitment and carries SOUL’s lifetime warranty to the original owner for street and track use.
Are these street legal? The headers are not CARB certified, so they are sold for off-road or competition use and are not legal for sale or use on pollution-controlled vehicles in California or other CARB states. They retain high-flow catalytic converters and run without a check engine light, but emissions legality depends on your state, so check your local rules before installing.

About SOUL Performance

SOUL Performance Products was founded by a group of automotive enthusiasts with deep industry experience and a commitment to doing right by their customers. Their mission is to deliver outstanding performance parts at fair pricing, backed by quality service and one of the best warranties in the industry. SOUL develops high-performance exhaust systems and components that are engineered for exceptional sound and proven performance, with products ready to ship quickly worldwide. Guided by core values of honesty, transparency, and passion for cars, they build strong community connections and prioritize customer satisfaction at every step. Operating out of a dedicated facility in Willow Grove, Pennsylvania, SOUL combines hands-on research, engineering, and manufacturing expertise to create parts that meet and exceed the demands of serious enthusiasts.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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SOUL Performance Long Tube Street Headers for 981 Porsche Boxster Spyder and Cayman GT4 [POR.GT4.STH]

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SOUL Performance Long Tube Street Headers for 981 Porsche Boxster Spyder and Cayman GT4

Development

Construction

Bolt On and Go

Features

Applications

Notes

Frequently Asked Questions

About SOUL Performance

Reviews