The all New Chase Bays Tucked Radiator for BMW is finally here! It's designed to free up space in BMW engine bays, improve cooling performance & Aesthetics. This radiator is a cooling upgrade, with more fluid capacity than stock, more direct airflow, & dual pass design. It's mounted under the core support to open up to 6" of space. This radiator has been rigorously track tested on our Chase Bays E36 drift car & on countless race/drift/show winning builds

We've designed this all aluminum radiator to fill every bit of space under the core support while still being able to run 16" electric fan. Requires some light cutting of front core support. More mod info below. We've integrated features no other competitor is offering. From fan sizing to modularity.

Shroud'r>We formerly sold our Radiator with a Fan Shroud, until Nov 2019. This was a great way to mount fans (Mounting fans directly to core will void your warranty and ruin the Radiator) and to increase cooling efficiency. The only problem is anything past 12mph...shrouds can actually restrict flow. We changed to fan brackets built into the radiator and no complete covering shroud. This decreased the price $175 dollars AND increased cooling efficiency.

Fans
It's important that the fan is on its own relay with proper sized wiring & fill point is the highest point in the system. These 2 things are commonly overlooked. We make a Dual Fan Relay Harness with 180° F Thermoswitch that simplifies the wiring. We don't currently have a single fan relay harness, but will soon.

Fill Point
Top of our radiator sits 6" lower than stock, so you have to make a New fill point. The 1st step is an inline filler neck.

Proper filler neck setup makes hose selection easier. We recommend on radiator itself with Raised Inline Filler Neck. Select -20AN for 1 side of Filler Neck under options, other side will be hoses you choose. If you're using OE Push-On style Silicone Hoses, you'd select "1.5mm Normal Hose" for 1 option & "-20AN" for other. The -20AN side will thread right into the radiator then twist the filler neck onto that. with the thick O-Ring Seal on both sides, getting the filler neck 0° vertical is easy with adjustment of both sides. Other option is putting it on upper water neck which requires some fab work.

Modular Inlet/Outlet & Reversible Orientation

Radiator was designed to be reversible with interchangeable inlet/outlet types. The radiator inlet/outlet have to be on the same side b/c of the dual pass design. It looks the same on top & bottom & brackets are centered.

The inlet/outlet are -20AN female threads. Just install the adapters you need. If you change your mind later, Just thread on New adapters. We offer OE style in 1.38", -16AN, & -20AN. We recommend you put radiator inlet/outlet closer to upper water neck since that hose is more visible.

Note:

• Don't Attach Fan Directly To Radiator Via Fan Zip Ties. Over Time This Can Wear Through The Core & Puncture It. Aluminum On Radiator Cores Is Very Thin. This Will Immediately Void Your Radiator Warranty