CSF 87-91 BMW M3 (E30) 2.7L Radiator

If you're working on your 1988-1991 BMW M3, especially a 2.7L model, keeping that engine cool is critical, whether you're on the street or the track. This all-aluminum radiator from CSF is built to handle the demands of keeping your E30 M3 running at its best. It's designed to offer improved cooling performance, making it a solid choice for high-horsepower builds or any motorsport application where extra cooling capacity is needed.

What sets this CSF radiator apart is its B-Tube Technology. Instead of standard oval tubes, CSF uses a specially engineered B-shaped tube. This design increases the heat transfer surface area by about 15% compared to regular tubes, giving you the efficiency of two smaller tubes in the same space. This allows for a dual liquid laminar flow, which helps dissipate heat more effectively. The radiator also features ultra-efficient, multi-louvered fins that are precisely aligned to maximize airflow through the core, and CSF carefully measures and tests these fin specifications in their wind-tunnel lab for optimal heat rejection. The core itself is 1-1/4 inches thick, and the entire unit is constructed from aluminum for a lighter weight and better heat dissipation than stock. The brackets and fittings are CNC machined for a durable, precise fit, and the inlet and outlet connections are designed to use your original hoses.

This CSF radiator is designed as a true drop-in fit, meaning you won't need to make any modifications to install it. It accepts all the original attaching components, including your quick-connect hoses, AC condenser, mounting brackets, and fan shroud. It also includes an all-aluminum race-style drain plug for easy draining and maintenance.