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Keep in mind its 1500 pounds lighter than the xm5/6 which when looking at power to weight of about 10-this is good for an equivelent of 150hp more than the x5m when taking power-weight into an account.
Another way to say that is to match the new m5 at 560hp the xm5/6 would need 710 hp-quite a signifigant difference.
However the big disapointment is in the acceleration. The e60 obliterated the e39m5 and this is a marginal increase in acceleration especially considering the e60 is a good 400 pounds lighter putting the total equivelent power within 20hp of each other. Better gas mileage sure but not a big difference.
Compared to the e39 which the e60 weighed the same however got 105 more hp. Disapointment however the e60 and s85 was so ahead of its time, it really was hard to improve on.
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