CSF Aluminum Performance Radiator - E46 320i, 323, 325, 328, 330, Z4

Uprate your BMW cooling system with a direct-fit, all‑alloy CSF radiator for E46 6‑cylinder and Z4 M54 models. This is the proven choice for fast road, track day and drift use, giving lower coolant temps, stronger construction and dependable performance lap after lap.

• All‑aluminium construction with welded metal end tanks - a robust replacement for brittle plastic tanks on ageing E46 and Z4 cooling systems
• High‑efficiency multi‑pass tube technology using CSF’s B‑tube core for maximised surface area and heat rejection
• Thicker core for enhanced thermal capacity while utilising thinner, lightweight material for efficiency
• Designed as a drop‑in, OE‑location replacement - retains factory shrouds, hoses and mounting points
• Engineered in the USA with wind tunnel, vibration, thermal cycle, burst pressure and salt spray validation at CSF’s production facilities
• Every unit leak‑tested and checked with a 30‑point inspection before shipping
• Backed by a 2‑year CSF warranty

We have installed this alloy rad on customer cars and in our own builds - results are consistently excellent with noticeably improved temperature control and reliability compared to stock. Ideal for anyone tackling hot track sessions, spirited B‑road driving or simply refreshing a tired factory cooler.

Fitment - manual transmission models:

• BMW 3 Series E46 1999-2005: 320i, 323i, 323Ci, 325i, 325Ci, 325xi, 328i, 328Ci, 330i, 330Ci, 330xi
• BMW Z4 E85/E86 2003-2008: 2.5i M54, 3.0i M54

Notes on installation: This oversized core is tailored for manual gearbox cars. As with any thicker core on the E46 platform, clearances are tighter than stock - particularly around the expansion tank and accessory belt - but in practice this has not posed an issue on road or Spec E46 track applications. Reuses factory fan shrouds, clips and hose connections for a clean, plug‑and‑play install.

Why upgrade your E46 or Z4 radiator:

• Common OEM failure points eliminated - no more cracked plastic end tanks under heat soak
• Stabilises coolant temps on circuit, in traffic and during summer touring
• Perfect foundation for a full cooling system refresh on M52TU and M54 engines

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Professional fitting: Want it installed properly the first time? Book fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.