The TOWMA High-Performance Downpipe for the Porsche 911 992 Turbo/S transforms your 992 Turbo S from fast to relentless. This upgrade isn't designed to stand out—it's designed to dominate. Available as a catless or with a high-flow sports catalytic converter.
Advantages
- Maximum flow — free diameter for minimum restriction
- More power — 30-40 extra hp with ECU tuning
- Faster turbo response — less backpressure, faster spooling
- Raw flat-six sound — aggressive, powerful character
- OEM+ fit — direct mounting without modifications
- T304 stainless steel — high-quality stainless steel
- TIG welded — perfect welds for optimum strength
Material & Construction
The TOWMA downpipe is manufactured from high-quality T304 stainless steel and fully TIG-welded for optimum strength and perfect flow.
Available in two variants:
1. Catless (without catalytic converter):
- Maximum flow and performance
- Loudest, most aggressive sound
- Maximum power gain (35-40 hp with tuning)
- Not MOT-proof in the Netherlands
- For track/export use only
2. High-Flow Sports Catalyst (200-cell):
- Balance between performance and emissions
- Sporty sound, slightly less loud than catless
- Good power gain (30-35 hp with tune)
- Possibly MOT-proof (depending on inspection)
- Suitable for daily use
Performance & Sound
Capital gain:
- Catless: +35-40 hp with ECU tuning
- High-flow cat: +30-35 hp with ECU tuning
- Without tuning: +12-18 hp (only due to better flow)
- Total power with tuning: 700+ hp possible! (standard 650 hp Turbo S)
Sound character:
The TOWMA downpipe transforms the twin-turbo flat-six:
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Idle: Deeper, more present flat-six bass
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Acceleration: Aggressive turbo whoosh and wastegate flutter
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High revs: Loud, race-inspired sound
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Deceleration: Pops and bangs (with tune)
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Downshifts: Aggressive backfire and crackling
Note: Catless is very loud. High-flow cat is sportier but more bearable for everyday use.
Installation & Assembly
The downpipe is designed for plug-and-play installation on the original Porsche mounting points.
Installation time: 3-4 hours for an experienced Porsche specialist
ECU Tuning: For optimal performance, ECU tuning is HIGHLY recommended. Popular tuners: COBB, VR Tuned, Fabspeed.
Compatibility
Suitable for:
- Porsche 911 992 Turbo (2020+) — 3.8L twin-turbo flat-six (580 hp)
- Porsche 911 992 Turbo S (2020+) — 3.8L twin-turbo flat-six (650 hp)
- Porsche 911 992 Turbo Cabriolet (2020+)
- Porsche 911 992 Turbo S Cabriolet (2020+)
Not suitable for:
- Porsche 911 992 Carrera/S — different engine (non-turbo)
- Porsche 911 992 GT3/GT3 RS — other engine (naturally aspirated)
Technical Specifications
| Characteristic |
Specification |
| Brand |
TOWMA Carbon & Performance Parts |
| Product |
High-Performance Downpipe |
| Material |
T304 Stainless Steel |
| Welding method |
TIG welded |
| Diameter |
76mm (3 inch) |
| Variants |
Catless or High-Flow Cat (200-cell) |
| Fit |
OEM+ direct fit |
| Suitable for |
911 992 Turbo/S (2020+) |
| Capital gains |
30-40 hp (with ECU tune) |
| Installation |
Plug and play, no welding |
| Warranty |
3 years on construction and fit |
| Price |
€1,645 |
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
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Do I need ECU tuning? Not required, but highly recommended. Without tuning, you'll gain 12-18 hp, with tuning, you'll gain 30-40 hp.
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Is this MOT-proof? Catless is NOT. High-flow cat is possible, depending on inspection.
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How loud is this? Catless is very loud. High-flow cat is sporty but more bearable.
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Will this fit my 992 Turbo (non-S)? Yes, the Turbo and Turbo S share the same engine and exhaust layout.
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How much power can I achieve? 700+ hp is possible with a downpipe and ECU tune on the Turbo S.
