PLM Mercedes Benz 5.5L AMG Heat Exchanger Cooling Kit E55 CLS55 SL55PLM (Private Label Mfg.) Mercedes Benz E55 AMG heat exchanger mounts in stock position. Supercharged Mercedes AMG's tend to overheat under hot weather or extreme driving conditions. If you increase boost or horsepower, expect your intake charge temp to rise even further. The solution is to add the upgraded Private Label Mfg. Power Driven heat exchanger. This heat exchanger will significantly reduce intake charge temps allowing you to keep power when