GRAIL Valved Exhaust System | ECE | suitable for BMW X4 M40i B58 G02 (model year 2018-2024)

GRAIL Valved Exhaust System
suitable for BMW X4 M40i B58 G02 (Bj. 2018-2024)

suitable for BMW X4 M40i B58 G02 (2018-2024) The GRAIL valve exhaust system for the BMW X4 M40i (G02) is engineered specifically for the B58 straight-six engine producing 260–265 kW (354–360 PS). Built from L304 stainless steel and controlled via the precision GRAIL valve management system, it delivers a commanding straight-six soundtrack on demand while remaining fully ECE type-approved for unrestricted daily road use. Choose your tip configuration – without tips, 4-pipe stainless steel, or 4-pipe black – and pair with optional installation at GRAIL. Pre-order now: the introductory price is valid only until the first sound file is released. Delivery from October 2026.

Highlights

• B58 Straight-Six Sound: The GRAIL valve management unlocks the full tonal character of the B58 engine – a crisp, layered inline-six note with a distinctive rasp under load.
• GRAIL Valve Management: Electronically controlled valve system for seamless switching between a refined everyday mode and an open, performance-oriented exhaust note.
• Rear Diffuser Presence: The 4-pipe tip layout – available in polished stainless steel or matte black – integrates cleanly into the G02 rear apron for a purposeful, symmetrical appearance.
• Driver-Focused Emotion: Every throttle input translates directly into an acoustic response – from a composed motorway cruise to a full-throttle straight-six crescendo at high revs.
• ECE Type Approval: Registration-free* in all participating ECE countries.
• German Engineering: Developed by German engineers for maximum quality.
• L304 Stainless Steel Construction: Corrosion-resistant, dimensionally stable, with a flawless surface finish.
• Flow Optimized: Efficient exhaust gas routing and heat dissipation.
• Drone-Free Sound Comfort: Absorption technology eliminates interference frequencies in the interior.
• OEM-Style Fitment: Designed for mounting on the original suspension points.

TÜV / ABE available upon request

We currently ship within Europe only.

If a part is not available, we will contact you with an estimated wait time.

If you wish to return a product after receiving it, we offer a 14-day returns policy. Custom-made products are not eligible for return, and return shipping is at the customer's expense. Full delivery and returns terms are on the “Delivery Information” page — the link is at the bottom of the page.

Products come with a warranty, detailed in a certificate included in the box.

To make a valid claim, you must prove the damage was not caused by you and that the warranty certificate is valid.

Full terms are on the “Terms & Conditions” page — the link is at the bottom of the page.