Although I do find the power of my 528 "adequate," I am really starting to long for the raw power of the V8. I haven't driven a 540 for any substantial length of time, but I will soon. I want to really determine what the difference is between the rack & pinion and recirculating ball systems. My car is sooooo good at speed, and handling those sweeping freeway connectors that I can't seeing giving much of that away. Stay tuned.