BMW M5 and Audi RS4: TG mag's guide to used hero cars
Bimmerforums - The Ultimate BMW Forum
Exhaust Showdown: BMW E39 M5 vs E46 M3
Battle of the M5s: E39 vs. E60
VIDEO: Is the E39 BMW M5 better than the legendary E60?
2000 BMW M5 for Sale - Cars & Bids
Battle of the M5s: E39 vs. E60
BMW M5 E60 v10 vs BMW M5 E39! EXHAUST & ACCELERATIONS!
The E60 BMW M5 Sedan and E61 BMW M5 Touring: 10 Is the Sweet Spot - autoevolution
BMW M5 E60 Buyer's Guide
Bimmerforums - The Ultimate BMW Forum
In-Depth Review: BMW M5 E60
E39 M5 Review Rush Magazine
M5 (E39) vs. M5 (E60) vs. M5 (F90) - PistonHeads UK