The hand-built M139 2.0-litre engine is a masterpiece of modern forced induction, but it generates phenomenal under-bonnet temperatures, particularly when tuned for higher output. Optimizing your thermal management is critical to ensuring your A45S delivers consistent power without the ECU pulling timing. Lower your intake air charge temperatures drastically by fitting high-capacity Chargecoolers, and keep your engine coolant vitals strictly regulated during continuous circuit driving with high-efficiency Radiators designed to handle the extreme thermal loads of this high-output AMG powerplant.