CSF High-Performance Auxiliary Radiator – BMW M2 / M240i / 340i / 430i / 440i (F-Chassis)

OVERVIEW

An industry-leading reputation and overwhelming success with BMW cooling has made CSF the number one cooling choice for the F87 M2 (N55), F3X 340i/430i/440i and F2X M240i. The auxiliary radiators are a natural addition to the popular F87 and F3X/F2X cooling suites.

Like the rest of the cooling system on these cars, the factory auxiliary radiators do a reasonable job in stock form. Once meaningful power is added and the car is driven hard, those factory units start to show their limits. CSF's replacement carries a 2-row 42mm high-performance core built on the company's exclusive B-Tube technology, with new "Track-Spec" 5mm ultra-efficient multi-louvered fins, increased tank volume and a larger core than OEM.

Construction is 100% all-aluminum TIG-welded, with OEM-style quick-connect inlet and outlet fittings and a detachable rock guard. Every unit is individually leak and pressure tested. The satin black finish keeps the OEM+ look under the bumper, and the radiator is a true drop-in requiring no modifications.

SPECS

• Sold individually
• 2-row 42mm high-performance core featuring CSF's exclusive B-Tube technology
• "Track-Spec" 5mm tall ultra-efficient fins with a multi-louvered design for maximum surface area contact and heat dissipation
• Increased tank volume and core size versus OEM
• 100% all-aluminum TIG-welded construction
• OEM-style quick-connect inlet and outlet
• Detachable rock guard included
• Individually leak and pressure tested
• Satin black finish for an OEM+ appearance
• True drop-in fit requiring no modifications to install
• Suitable for professional racing, street performance or OEM replacement
• Replaces OEM part numbers 17118625447 and 17218625445
• CSF 2-year limited warranty, under normal use and service, to the original purchaser of the vehicle in which the product was originally installed

PARTS INCLUDED

• One (1) CSF #8355 high-performance auxiliary radiator
• Detachable rock guard
• Complete kit as supplied by CSF Radiators; CSF does not publish a full bill of materials for this part — see the instructions packed in the box.

TECH RESOURCES

Additional Parts Required

• None. CSF Radiators specifies no additional hardware for this part — it is a direct-fit replacement using the OEM mounting points and quick-connect fittings.
• Quantity: sold individually. CSF notes the F87 M2 (N55) requires only one cooler; on the F3X 340i/430i/440i and F2X M240i this part replaces BMW auxiliary radiator 17118625447 only.
• Installer-supplied: fresh BMW-spec coolant and distilled water to refill and bleed the system, plus a drain pan.

Installation

• CSF does not publish a downloadable installation PDF for this auxiliary radiator. Printed installation instructions are packed in the box.
• Installation is a direct swap onto the factory mounting points using the OEM quick-connect lines; no cutting or drilling is required for the intended applications.
• Some F3X/F2X cars that did not leave the factory equipped with BMW part 17118625447 may require minor trimming of the air duct to clear the larger core — check clearance before final assembly.
• Bleed the cooling system completely after refilling before the car is driven.
• Need help before or during the install? Contact Speed Logic and we will walk you through it.

Notes

• Fitment and years above follow CSF's published application data for #8355.
• CSF notes that some F3X 340i/430i/440i and F2X M240i cars did not leave the factory with an auxiliary radiator — check your VIN with Speed Logic before ordering, and confirm the quantity required for your car.

PART NUMBER

• CSF #8355

VEHICLE APPLICATIONS