BMW 3/4/2 Series G20/G22/G42 B58 Valvetronic Catback Titanium Exhaust System

Engineered for BMW M340i G20 (Sedan, 2019+), M440i G22 (Coupé, 2020+), and M240i G42 (2-Series Coupé, 2022+) with the B58 3.0L inline-six turbo engine, this Valvetronic Catback Titanium Exhaust System combines weight reduction, premium aesthetic, and a sharp metallic signature layered onto the B58 inline-six character. It ships with its own electronic control box and wireless remote. Manufactured in Europe and quality-controlled by BYC Performance, the system bolts directly to the stock mid-pipe v-band.

The titanium construction is significantly lighter than stainless steel, with natural heat tinting (blue-purple-gold gradient) becoming its visual signature. Paired with the B58's 382 hp (M340i / M440i) and 374 hp (M240i) output, this catback layers a sharp, high-frequency metallic note onto the inline-six character. 90 mm twin exit tips are customer-selectable in Glossy Black Stainless, Polished Stainless, Matte Carbon Fiber, or Glossy Carbon Fiber.

Key Features

• Included Electronic Control Box and Remote: System ships with its own valve control box and wireless remote; integrated during exhaust installation, then valve open/close is operated via the supplied remote.
• Pure Titanium Construction: Significantly lighter than stainless steel, race-grade material.
• Natural Heat Tinting: Blue-purple-gold gradient oxidation under heat — premium track aesthetic.
• B58 Inline-Six + Titanium Sound Character: Sharp high-frequency titanium signature layered over the straight-six full character.
• 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. Twin outlet, laser-welded detailing.
• OEM Hanger Compatible: Direct bolt-on fit to factory exhaust hangers — no hanger modification required.
• M340i / M440i / M240i Diffuser Fitment: Exit tips center in the M Performance rear diffuser cutout.

Titanium vs. Stainless Steel — This Is Titanium

This product is the titanium variant:

• Titanium (this product): Significantly lighter, sharp high-frequency note, heat-tint finish, premium track aesthetic
• T304 Stainless Steel (separate SKU): Deeper and fuller sound tone, more durable surface, more affordable
• For weight, premium aesthetic & sharp sound: titanium preferred (this product)
• For full inline-six character + value: stainless preferred

Valvetronic System — Sound Control by Driving Mode

The valvetronic exhaust integrates an electronic valve into the mid-pipe to deliver two sound characters:

• Valve Closed: OEM+ refined character — ideal for long drives, urban driving, and night use.
• Valve Open: Full B58 inline-six tone + sharp titanium metallic signature — a rich, track-character note.
• Remote Control: Open or close the valve at any time via the included wireless remote.

Vehicle Fitment

This BMW G20/G22/G42 B58 titanium catback exhaust fits the following engine/trim combinations perfectly:

• BMW M340i G20 Sedan (2019, 2020, 2021, 2022, 2023, 2024, 2025) — B58 3.0L inline-six (~382 hp)
• BMW M440i G22 Coupé (2020, 2021, 2022, 2023, 2024, 2025) — B58 3.0L inline-six (~382 hp)
• BMW M240i G42 Coupé (2022, 2023, 2024, 2025) — B58 3.0L inline-six (~374 hp)
• Compatible with xDrive and sDrive trims
• Compatible with M Performance rear diffuser trim

Incompatibility Note: This catback is NOT compatible with BMW M3 G80 / M4 G82 / M2 G87 — these cars use the S58 inline-six engine (a completely different twin-turbo M engine, not B58) with different exhaust geometry, mid-pipe configuration, and hanger points. 320i/330i/420i/430i with the B48 engine require a separate catback SKU (G20/G22 B48 variant).

Technical Specifications

• Material: Titanium (race-grade alloy)
• Configuration: Catback (entire exhaust from the catalyst/downpipe back to the tailpipes)
• Mid-pipe: B58 inline-six geometry
• Valve Control: Included electronic control box + wireless remote
• Weight: Significantly lighter than the stainless catback
• Exit Tips: 90 mm twin tips — choose from Glossy Black Stainless, Polished Stainless, Matte Carbon Fiber, or Glossy Carbon Fiber
• Sound Character: Dual-mode (valve closed: OEM+, valve open: inline-six + sharp titanium tonal)
• Bumper Fitment: M340i / M440i / M240i M Performance rear diffuser
• 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 titanium catback on hanger points and torque the v-band clamp (torque: 10 Nm — lower than stainless).
6. Confirm the exit tips center in the rear diffuser cutout.
7. Pair the wireless remote and test valve open/close operation.

Care & Maintenance

Titanium is naturally corrosion-resistant; heat tinting (blue-purple-gold transition) forms during initial warm-up cycles and is the signature of titanium aesthetic — do not wipe it off. Wipe surfaces with a soft cloth only, DO NOT use stainless polishing chemicals. If carbon fiber tips were selected, 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. The control box is mounted during installation; you then open and close the valve using the supplied remote.

How loud is it?
Calm and daily-friendly with the valve closed, noticeably fuller and more aggressive with the valve open. Titanium layers a sharp high-frequency metallic note onto the B58 inline-six character.

How much lighter is titanium?
Titanium is roughly half the density of stainless steel, so for the same geometry it delivers a meaningful weight saving.

Is heat tinting (color change) a defect?
No. The blue-purple-gold gradient from titanium oxidation under heat is the aesthetic signature of titanium exhausts — it's considered a mark of quality.

Is it TÜV / E-mark approved?
The catback section does not include a catalyst, so emissions are unchanged. Qualifies for TÜV approval in most European markets.

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

Is it compatible with BMW M3 G80 or M4 G82?
No. M3 G80 / M4 G82 / M2 G87 use the S58 engine (a completely different twin-turbo M engine, not B58) with different exhaust geometry. This catback is for B58-engined M340i/M440i/M240i only.

Is it compatible with 320i, 330i, 420i or 430i?
No. 320i/330i/420i/430i use the B48 4-cylinder engine; the G20/G22 B48 catback SKU is required.

Does it fit the BMW M240i G42?
Yes. M240i G42 (2022+) is fully compatible thanks to the shared B58 engine.

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

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 M340i titanium exhausts, M440i valvetronic systems, M240i G42 titanium catbacks, and many more high-quality performance components. All parts are built with motorsport-grade materials and undergo strict quality control.