BMW M3 G80 / M4 G82 / M2 G87 Valvetronic Catback Double Mid-Pipe Stainless Steel Exhaust System

Engineered for BMW M3 G80, M4 G82, and M2 G87 owners, this Valvetronic Catback Double Mid-Pipe Stainless Steel Exhaust System ships with its own electronic control box and wireless remote — valve management is integrated during installation and afterward operated via the included remote. Manufactured in Europe and quality-controlled by BYC Performance, this system bolts directly to the stock mid-pipe v-band.

The double mid-pipe geometry delivers a more aggressive and fuller sound character via two parallel flow paths. Versus the single mid-pipe, it offers slightly higher airflow at high RPM — translating to a louder track-tone bias. Across the S58's 473-543 hp (M3/M4) and 460 hp (M2 G87) output range, expect a rich exhaust dynamic. 90 mm twin exit tips are customer-selectable in Glossy Black Stainless, Polished Stainless, Matte Carbon Fiber, or Glossy Carbon Fiber finishes.

Key Features

• Included Electronic Control Box and Remote: System ships with its own valve control box and wireless remote.
• Double Mid-Pipe: Twin parallel flow paths, higher high-RPM airflow, more aggressive sound character.
• T304 Stainless Steel: Corrosion-resistant premium alloy.
• Aggressive Sound Character: Fuller and louder than the single mid-pipe — race-tone biased.
• CNC-Bent Piping: Smooth internal surface, flow-optimized geometry.
• Customer-Selectable 90 mm Exit Tips: Choice of Glossy Black Stainless, Polished Stainless, Matte Carbon Fiber, or Glossy Carbon Fiber finishes. Twin outlet, laser-welded detailing.
• OEM Hanger Compatible: Direct bolt-on fit to factory exhaust hangers — no hanger modification required.

Titanium vs. Stainless Steel — This Is Stainless

This product is the T304 stainless steel variant:

• T304 Stainless Steel (this product): Durable, deeper sound tone, lifetime rust-resistance, more affordable
• Titanium (Grade 5): noticeably lighter, sharper metallic note, heat-tint finish, higher cost
• For weight reduction & premium aesthetic: titanium preferred
• For cost and durability balance: stainless steel (this product)

Single, Double, and Equal-Length Mid-Pipe — The Difference

Single, double, and equal-length mid-pipe configurations sit at the same price tier — there is no price difference; the choice is entirely about the sound you want:

• Single Mid-Pipe: Clean flow path, more tonal and daily-friendly sound character.
• Double Mid-Pipe — this product: Twin parallel flow paths, more aggressive and fuller sound, slightly higher high-RPM airflow. Ideal for drivers seeking a track tone.
• Equal-Length: Two parallel pipes of identical length, post-turbine pulse synchronization — cleanest high-RPM note and marginal performance edge.

Vehicle Fitment

This BMW M3 G80 / M4 G82 / M2 G87 catback exhaust fits the following models:

• BMW M3 G80 Sedan (2021, 2022, 2023, 2024, 2025) — S58
• BMW M3 Touring G81 (2022+) — S58
• BMW M3 Competition G80 / xDrive
• BMW M4 G82 Coupe (2021+) — S58
• BMW M4 G83 Convertible / Cabriolet (2021+) — S58
• BMW M4 Competition G82 / G83 / CSL G82
• BMW M2 G87 Coupe (2023+) — S58

Compatible with all trims (standard, Competition, xDrive, CS, CSL). NOT compatible with previous-gen M3 F80 / M4 F82.

Technical Specifications

• Material: T304 Stainless Steel
• Configuration: Catback
• Mid-pipe: Double
• Valve Control: Included electronic control box + wireless remote
• Exit Tips: 90 mm twin tips — choose from Glossy Black Stainless, Polished Stainless, Matte Carbon Fiber, or Glossy Carbon Fiber
• Sound Character: Aggressive, full (valve closed: OEM+, valve open: loud track tone)
• Origin: Europe

Installation Notes

Catback exhaust replacement requires lift access and professional installation. General procedure:

1. Lift the vehicle and loosen rear bumper underbody screws.
2. Release the stock catback mid-pipe v-band clamp.
3. Replace OEM exhaust hangers (rubber isolators) if worn.
4. Mount the included electronic control box in a suitable location and connect the valve actuator wiring.
5. Hang the new catback on hanger points and torque the v-band clamp (torque: 12 Nm).
6. Confirm the exit tips are centered in the bumper cutout.
7. Pair the wireless remote and test valve open/close operation.

Care & Maintenance

T304 stainless is corrosion-resistant. Wipe polished tips with a soft cloth; avoid aggressive chemicals. If you selected carbon fiber tips, use a carbon-safe cleaner. Re-check bolt torque after first 500 km.

FAQ

How is the exhaust valve controlled?
Via the included electronic control box and wireless remote.

How loud is it?
Calm and daily-friendly with the valve closed, noticeably fuller and more aggressive with the valve open. More aggressive and fuller than the single mid-pipe.

Does it fit the M2 G87?
Yes. The shared S58 engine makes this fully compatible with the BMW M2 G87 Coupe (2023+).

Does it fit the M4 G83 Convertible?
Yes, the BMW M4 G83 Convertible (Cabriolet) is fully compatible.

Welded or direct bolt-on?
Direct bolt-on. V-band clamp + hanger system, no welding required.

Compatible with previous-gen F80 / F82?
No. This catback is S58-only (G80/G82/G87).

Shipping time?
In-stock items ship within 1-3 business days via partner couriers.

Warranty?
BYC Performance offers a 12-month manufacturer warranty.

Why BYC Performance?

BYC Performance is a Turkey-based performance tuning specialist sourcing premium parts from leading European manufacturers and supplying them to the Turkish market. Our catalog includes BMW M3 G80 catback exhausts, BMW M4 G82 valvetronic systems, BMW M2 G87 exhausts, and many more high-quality performance components.