The TOWMA Valved Cat-Back Exhaust System for the BMW M2 G87 is designed for the true enthusiast who wants visual impact, maximum flow, and a sound that matches the sporty character of the S58 engine. It features an integrated valved system and a choice of a single midpipe or equal-length midpipe configuration.
Advantages
- Valved system — full control from smooth to raw
- Choice of midpipe — Single or Equal Length for different sounds
- More power — 8-15 hp extra through better flow
- Aggressive S58 sound — deep, sporty 6-cylinder sound
- OEM+ fit — direct mounting without modifications
- T304 stainless steel — high-quality stainless steel
- TIG welded — perfect welds for optimum strength
- Finish options — polished, black chrome, or carbon tips
Material & Construction
The TOWMA catback system is manufactured from high-quality T304 stainless steel and fully TIG-welded for optimum flow and durability.
The integrated valved system uses electronically controlled valves:
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Valves closed: Quieter for cruising and everyday use
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Valves open: Rougher when driving sportily
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Integrated with M2 drive modes: Works with Comfort/Sport/Sport+ modes
Midpipe configurations:
1. Single Midpipe:
- Traditional single pipe configuration
- Deeper, fuller sound
- More backpressure for low-end torque
- Classic sports exhaust character
2. Equal Length Midpipe:
- Equal length pipes for both cylinder banks
- More balanced sound
- Better flow for high-end power
- Race-inspired design
Finish options:
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Polished Stainless Steel: Classic, glossy finish
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Black Chrome: Modern, dark look
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Carbon Tips: Exclusive carbon fiber tips
Sound & Performance
Sound character:
The TOWMA catback allows the S58 3.0L inline-6 turbo to perform to its full potential:
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Idle (valves closed): Deep, menacing 6-cylinder growl
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Idle (valves open): Aggressive, sporty character
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Acceleration: Screaming 6-cylinder with turbo whoosh
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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
Performance:
- Weight saving: 10-15kg compared to OEM
- Power gain: 8-15 hp (due to better flow)
- Improved throttle response due to lower back pressure
- Better throttle response
Note: This system is loud with the valves open. Perfect for track and spirited driving.
Installation & Assembly
The catback system is designed for plug-and-play installation on the original BMW mounting points.
Installation steps:
- Lift the M2 on a lifting bridge
- Remove original catback system (2 bolts at catalytic converters, 4 hangers)
- Install TOWMA catback with supplied gaskets
- Connect valve actuators to OEM wiring
- Test valve functionality in all drive modes
- Check for leaks and alignment with bumper
Installation time: 2-3 hours for an experienced BMW specialist
Recommendation: Professional installation by an authorized BMW M specialist or performance shop is recommended for optimal alignment and valve functionality.
Compatibility
Suitable for:
- BMW M2 G87 (2023+) — S58 3.0L inline-6 turbo
Not suitable for:
- BMW M2 F87 (2016-2020) — previous generation
- BMW 2 Series without M
Note: This is only for the G87 M2 (2023+). Check your chassis number before ordering.
Technical Specifications
| Characteristic |
Specification |
| Brand |
TOWMA Carbon & Performance Parts |
| Product |
Valved Cat-Back Exhaust System |
| Material |
T304 Stainless Steel |
| Welding method |
TIG welded |
| Valves |
Electronically controlled |
| Midpipe options |
Single of Equal Length |
| Finish options |
Polished, Black Chrome, Carbon Tips |
| Weight saving |
10-15kg compared to OEM |
| Capital gains |
8-15 hp |
| Fit |
OEM+ direct fit |
| Suitable for |
M2 G87 (2023+) |
| Warranty |
3 years on construction and fit |
| Price |
€3,299 |
Maintenance & Warranty
Maintenance:
- Check valve actuators regularly for functionality
- Inspect for cracks or leaks
- Clean the outside with stainless steel cleaner for a shine
- Check mounting bolts annually
- Polishing tips with stainless steel polish for high gloss
Warranty:
TOWMA offers a 3-year warranty on construction, fit, and finish. The warranty covers manufacturing defects, leaks, and valve problems. Damage due to improper installation, accidents, or misuse is not covered by the warranty.
Frequently Asked Questions
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Choose a single or equal length midpipe? Single for a deeper, fuller sound. Equal length for a balanced sound and better high-end flow.
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How loud is this system? Loud with the valves open, especially at high RPM. With the valves closed, it's bearable but louder than OEM.
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Is this MOT-compliant? Possibly, depending on inspection. Less loud than catless downpipes.
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Do the valves work with my drive modes? Yes, they integrate with BMW's OEM valve controls (Comfort/Sport/Sport+).
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Will I get more power? Yes, 8-15 hp due to improved flow. For more power, combine it with downpipes and ECU tuning.
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Which finish should I choose? Polished for classic, Black Chrome for modern, Carbon Tips for exclusive.
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Can I combine this with downpipes? Yes, it's perfect for combining with aftermarket downpipes for maximum flow.
