Dinan Carbon Fiber Turbo Inlet Pipe - BMW 340i / 440i 2016-2026

The Dinan turbo inlet pipe replaces the failure-prone plastic factory inlet with a more robust carbon fiber pipe and CNC-machined fittings for a direct OEM-style fit. Removing the factory resonators and enlarging the tract yields an average 10.8% larger internal diameter and 24% more internal volume, flowing up to 24% more air than stock. The smoother, more uniform path lets the turbo work more efficiently while amplifying the induction soundtrack.

Specifications

Documents: Installation Instructions (PDF)

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy