dinan engine chip

in San Francisco Bay Area (south bay, but i can drive to meet) Well cared for rare wagon. Super clean. I just finished refreshing all possible wear components. (search the forum for all possible topics - i'll try to answer any inquiries). But an white V8 wagon came on the market and i couldn't...

Couple questions on a 540it purchase...... 1. what is the diff between premium sound and standard on the E39. 2. Does 330 hp sound right with a "Dinan Options: - Engine chip - Transmission chip - Cold air intake" 3. What is a Performance rear axel and torque converter do thanks for those who...