Hi i have 4pot callipers already on my car they look the same like sumitomo i hope they are the right ones... but in the rear it still has the drum brakes. some videos from historc racing in finland. https://www.youtube.com/watch?v=0adA09ACA8w and rallying action lots of 6cyl music. https://www.youtube.com/watch?v=pFUOrA6xfa0 Here is my brothers 355 hp M3 in rally finland last year very nice sound https://www.youtube.com/watch?v=4nSzd5E2-Nc unfortunetly he jumped over 45meters on the 2 stage and broke the radiator, oil sump, front suspension, bumper, sump guard and so on.. he was leading RWD class at the moment. WRC cars didnt jump any further.