Quote:
Originally Posted by Gixxerboy63
Looking at some published specs, a 4.6is with an ESS supercharger will increase the stock hp and torque to 445hp/460tq... good for 5.2 seconds to 60mph... (almost identical 0-60 performance numbers produced by a stock 2003 E39 M5, which is very impressive for a 6000lb+ vehicle!)
Impressive specs, yes! ...but the short answer is still NO; you will get spanked by an X5M! 
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I found this website to be very interesting;
BMW 0-60 Times & BMW Quarter Mile Times | BMW E36, X5, BMW M3 0-60, M5, M6, M1, 330, Z4 and Cabrio Bimmer 0 to 60 stats!
In my previous quote, I thought there was published information to support the idea that an ESS SC X5 4.6is would be within striking range of an E39 M5. Apparently I was mistaken.
The SC X5 would have performance numbers more similar to a 2001 540i/6 speed rather than ANY 2000 or newer M-car (with the exception of the M3 convertible)
The idea of having a 445+ hp X5 sounds very intriguing, but I would not be happy if I spent the money and still get my A** handed to my by a stock E39 M5 (that I could have bought for not whole lot more than the cost of the SC conversion).