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Originally Posted by JCL
I understood that the sport version (is?) was to be a twin-turbo V8 of 4.4 litres, with 400+ hp. If so, the move to turbocharging is consistent with the twin-turbo 3.0 I6 design philosophy, and is likely designed to keep weight down, add power, and avoid the corporate embarrassment of a gas-guzzling 5.0 (which may be OK in an M5, but would be too much of a bad-news target for a vehicle intended to reach a broader audience).
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Turbos would be great. =) I hope they make it more like 500 HP though to compete with the AMG ML and Cayenne Turbo.
The "is" version is not intended to reach a broad audience. It has a very limited target market like the M5 and M3. If you look at the past production volumes, I believe less than 1% of all X5's were 4.6is in 02-03. I'm sure it was similar for the 4.8is.