Original sentence: the m5 can produce 507 horsepower with a top speed of 155 with limiter but with it removed it can reach 204 mph
Edited sentence: As of this article, this company claims to have produced the worlds fastest M5.BMW Motorsport has not yet produced any special variants of the E60.Dinan Cars produces an uprated NA version of the V10 with a displacement of 5.7 litres for up to.G-Power — This German based tuning company has recently released a powerful twin-supercharged variant of the E60 M5 called the "G-Power Hurricane M5".Hamann "Edition Race" — Tuner Hamann produces several E60 variants, but the most exotic is "Edition Race," with a wide body-kit, larger wheels and tyres, a tuned engine (including removal of the speed limiter), and customized interior details.However, German tuner Hartge has created a modified version without the electronic speed limiter; it also features upgraded wheels and tyres to cope with high speed.It has a top speed of about  (down from the standard + due to the extra drag/weight from the wider, heavier tyres and bodykit).Italian tuner Racing Dynamics (RD Sport in US) offers an engine tuning programme for the E60 M5 called the RS56 with increased capacity from 5.0 to 5.6 L and.This claim can rightfully be made considering that this variant of the M5 boasts over  and has set the world record for the fastest Sedan with a top speed of