I have a Cadillac SRX right now as a rental and it has the 3.6. IMO, the engine is undersized for the application in an SRX. It does get up, but not as well as my 99 could. I'd have to say that after my 150 mile trip this morning across the state that I'm disappointed. The engine had an annoying whine when getting into the throttle and the RPMs would stay much higher (causing a louder engine) to produce the torque needed to pass and just plain accelerate.