cl 600 with 700hp chip tuning

I have a totally cut CL 600 from a Russian reimport at a mock price. To my surprise I read in the papers that he has received a chip tuning and says and writes 700 hp. When driving, I thought that must be more than 500 hp. Alone the intermediate sprints — 80-120 in 1,2 sec. — 200-230 in 1,3sec. –300-320 in 2,2sec. are very brutal forces. According to papers, suspension and brakes are adapted, but sometimes I have the feeling that the if the brakes are a little weak on the chest, can you have something like this tested? Greetings tognino