Originally Posted by Maruzo

What was your tune? That's outstanding output considering the factory X5M already puts out 555 horsepower.

I've never driven anything with so much power. My dad has a 2006 S65 that puts out 600HP from a v12. But the power delivery is smooth and understated because the car is so heavy and quiet. The only thing that gave it away was the v12 growl from the exhaust.

The v8 twin turbo from a 2014 550i has 445HP, which is 100 less than the E70 X5M. I love the power on that 5 series.

This gives me a good gauge on the E70's capabilities.

I'm salivating just thinking about what a 600HP E70 can do.