BMS Replacement Intercooler for E Chassis BMWDescription Deliver consistent, reliable power run after run. The BMS N54 N55 replacement E Chassis intercooler for BMW delivers better cooling, more power to the wheels, and allows you to hold that power longer during extended runs. With a larger core and more surface area than stock, your intercooler pressure drop is reduced and cooling dramatically improved. Resulting in peak power gains of around 10whp and during longer pulls and back to back runs