Dinan High Performance Heat Exchanger - BMW S55 2015-2021

The Dinan high performance heat exchanger cools the S55 engine's charge air circuit with a core that is 40mm thick versus the 24mm stock unit, carrying 60% more volume and 19% more face area. The 40mm depth was chosen to preserve airflow to the main radiator behind it, so normal engine cooling is unaffected. The larger core lowers water temperature to the intercooler by an average of 9 degrees across the RPM range, which in turn cools intake air by a further 6 degrees on average and yields a consistent 10 HP and 20 lb-ft of torque with no change to the engine tune. It is rubber mounted for vibration isolation and track tested for consistent performance under extreme conditions.

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