OK I'm confused here...how did you know it was a 2010 model when the new ones only have minor changes from the previous 390 hp supercharged version?

And...it was a 1/4 mile ahead of you after you covered 1/4 mile plus a 1 second pause...are you sure 'bout that? You're basically saying the RR Sport SC covers 1/2 mile in under 16 seconds...it doesn't. That would make it faster than a Bugatti Veyon...it isn't. It has a lot of power but it's heavy at 5900 lbs...I think the last test I saw listed it at 13.7 in the 1/4, so a tad slower than an E46 M3, but no slouch. Definitely a bit quicker than the 4.8 but it shouldn't leave you for dead.

Just curious, why do you have both an X5 M and a 4.8i?

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2017 Nissan GTR Red/black - Tune/midpipe
2013 BMW X5 50i M-sport Alpine white/black - Dinan stage 1
2016 Jaguar F-Type R Gray/red