The BMW has a highly advanced 4.4-liter V8 and is clearly what separates the 545i from lesser models. The V8 engines valves make use of dual variable timing and lift to the extent that conventional throttle resonse is unbelievable at all RPM ranges. Clearly the 545 parts are still under warranty, however upgrades for performance and accessories like a K&N Air Filter, or a car cover by Covercraft are still a must.