With speedlimiter about 156 mph. No, I don´t thought to modify it with a CarHifi-System. I only have the HiFi-System Professional (S0677). I started my job as a retail dealer in a big company for electronics.. Then I was friendly for customers, started study in economy and then I got my today´s job. I invested every month 1600 USD for three years in something I don´t want to write here. The interest were very high at that time ( 88,7 % a year , I can show you proof )and with my jobs loan I have more money if I can spend in my whole life. If you use a little bit your brain, have an econmy-knowledge and work a little bit, everyone can be rich :-)