Dinan Carbon Fiber Cold Air Intake - BMW B58 (G20/G22/G42) 2020-2026

The Dinan Cold Air Intake for the B58-powered G2x M240i, M340i and M440i reworks the entire lower box, not just the lid, to house a custom free-flowing filter 40% larger than stock at 115 square inches. A patterned secondary inlet on the side opposite the engine adds volume without raising intake temperatures, and the carbon fiber system outflows the stock intake by 58% while adding up to 9 WHP and 8 lb-ft at 6500 RPM. Unlike the earlier version it is compatible with every G2x Mx40i whether or not the car has factory strut bracing.

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