Don't be fooled by other high-performance aftermarket options that utilize the OEM plastic rock guard. The OEM rock guard's vertical channel design is specifically designed to only work with the tube spacing found on the OEM core. When the OEM rock guard is installed on an aftermarket radiator, it actually blocks a significant amount of surface area. Obviously this is detrimental to the intended performance. During CSF's own R&D phase, CSF analyzed both the OEM and other aftermarket offerings and decided to go the extra mile. CSF redesigned the included rock guard to allow maximum flow to the radiator core, while still offering ample protection from small rocks and road debris - all proven on CSF's in-house wind tunnel. CSF's new Auxiliary Radiator fits both the left and right side of the vehicle as a drop-in fit. Thus requiring no modifications to install. Each features CNC machined mounting brackets and OEM style "Quick Connect" inlet/outlet connections. This makes for a true plug-and-play installation that does not interfere with aftermarket performance aero modifications.
This Part Fits:
Year
Make
Model
Submodel
2023-2025
BMW
M240i
Base
2022-2025
BMW
M240i xDrive
Base
2020-2025
BMW
M340i
Base
2020-2025
BMW
M340i xDrive
Base
2021-2026
BMW
M440i
Base
2022-2025
BMW
M440i Gran Coupe
Base
2021-2026
BMW
M440i xDrive
Base
2022-2025
BMW
M440i xDrive Gran Coupe
Base
2022-2026
BMW
Z4
M40i
2020
BMW
Z4
M40i First Edition
2020-2021
BMW
Z4
sDrive M40i
2019-2026
BMW
Z4
sDrive30i
2024
Toyota
GR Supra
45th Anniversary Edition
2021-2022
Toyota
GR Supra
A91 Edition
2023
Toyota
GR Supra
A91-MT Edition
2020-2026
Toyota
GR Supra
Base
2020
Toyota
GR Supra
Launch Edition
2026
Toyota
GR Supra
MkV Final Edition
2020-2026
Toyota
GR Supra
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TERMS (REQUIRED)
OFF-ROAD USE POLICY & EMISSIONS COMPLIANCE NOTICE
California Proposition 65 Warning:
This product can expose you to chemicals such as lead and lead compounds, which are known to the State of
California to cause cancer or birth defects or other reproductive harm. For more information, visit
www.P65Warnings.ca.gov.
Under the federal Clean Air Act (42 U.S.C. §7522(a)(3)), it is illegal to manufacture, sell,
install, or use any part that defeats or alters a motor vehicle’s emission control system for use on public
roads. Unless a product has received an Executive Order (EO) from the California Air Resources Board (CARB),
it is not legal for use or installation on any pollution-controlled vehicle driven on public highways.
Civil penalties up to $4,819 per violation per vehicle
Possible criminal penalties under the Clean Air Act
Revocation of registration or smog certification by DMV or local authorities
State & Local Regulations:
Some states have CARB-equivalent or independent emissions laws. Customers are responsible for verifying local
regulations before purchasing or installing emissions-related products.
Intended Use & Customer Certification:
All performance, racing, or competition parts sold by this company are intended solely for off-road,
closed-course, or competition use on vehicles that are never registered or used on public highways.
Company Policy Statement
Kies Motorsports, LLC sells and markets these products for lawful use only. We do not condone or authorize the
use of emission-control defeat devices or any modification that violates the Clean Air Act or state
regulations.