The TOWMA High-Flow Headers for the Porsche 718 Cayman/Spyder/GT4 are built for those who want to hear more than just silence—for whom performance isn't an option, but a lifestyle. This upgrade delivers maximum flow and a raw, unmistakable flat-six sound.
Advantages
- Maximum flow — significant reduction in back pressure
- More power — 15-20 extra hp
- Faster throttle response — more direct throttle response
- Pure flat-six sound — raw, unmistakably Porsche
- High-flow sports catalysts — enhanced performance with emissions control
- OEM+ fit — direct mounting without modifications
- T304 stainless steel — high-quality stainless steel
- TIG welded — perfect welds for optimum strength
Material & Construction
The TOWMA headers are manufactured from high-quality T304 stainless steel and fully TIG-welded for a perfect finish and optimum flow.
The headers are equipped with high-flow sports catalysts (200-cell) integrated for improved performance and emissions control. This ensures:
- Better flow than OEM catalysts
- Possibly MOT-proof (depending on inspection)
- Balance between performance and emissions
- Suitable for daily use
Performance & Sound
Capital gain:
- +15-20 hp due to better flow
- Total power: 435+ hp possible (standard 420 hp GT4)
Sound character:
The TOWMA headers allow the naturally aspirated 4.0L flat-six to perform to its full potential:
-
Idle: Deeper, more present flat-six hum
-
Acceleration: Screaming, metallic flat-six scream
-
High revs: Deafening, racing-level sound (8000+ rpm)
-
Deceleration: Pops and crackling
-
Downshifts: Aggressive backfire
Note: Headers change the sound significantly — louder and rawer than OEM.
Installation & Assembly
The headers are designed for plug-and-play installation on the original Porsche mounting points.
Installation time: 4-6 hours for an experienced Porsche specialist
Recommendation: Professional installation by a certified Porsche specialist is STRONGLY recommended. Installing headers is more complex than downpipes.
Compatibility
Suitable for:
- Porsche 718 Cayman GT4 (2020+) — 4.0L flat-six NA
- Porsche 718 Spyder (2020+) — 4.0L flat-six NA
- Porsche 718 Cayman GTS 4.0 (2020+) — 4.0L flat-six NA
- Porsche 718 Boxster GTS 4.0 (2020+) — 4.0L flat-six NA
Not suitable for:
- Porsche 718 Cayman/Boxster (2.0L/2.5L turbo) — different engine
- Porsche 718 Cayman GT4 RS — different exhaust layout
Technical Specifications
| Characteristic |
Specification |
| Brand |
TOWMA Carbon & Performance Parts |
| Product |
High-Flow Headers |
| Material |
T304 Stainless Steel |
| Welding method |
TIG welded |
| Catalysts |
High-Flow Sportcat (200-cell) |
| Fit |
OEM+ direct fit |
| Suitable for |
718 GT4/Spyder/GTS 4.0 (2020+) |
| Capital gains |
15-20 hp |
| Installation |
Plug and play, no welding |
| Warranty |
3 years on construction and fit |
| Price |
€1,499 |
Maintenance & Warranty
Maintenance:
- Check flanges for leaks regularly
- Inspect gaskets annually
- Clean the outside with stainless steel cleaner
- Check mounting bolts for tightness
Warranty:
TOWMA offers a 3-year warranty on construction, fit and finish.
Frequently Asked Questions
-
What's the difference between headers and downpipes? Headers replace the exhaust manifolds (directly after the engine). Downpipes replace the catalytic converters. Headers provide a greater power gain.
-
Do I need ECU tuning? Not required, but recommended for optimal performance.
-
Is this MOT-proof? Possibly, because it has high-flow sports catalytic converters. It depends on the inspection.
-
How loud is this? Significantly louder than OEM. The flat-six sound becomes rawer and more metallic.
-
Can I combine this with a downpipe? Yes, headers and a downpipe provide maximum flow and power.
