I don't know about the EU, but you won't see an R8 (or anything else) sold (legally) in the US without that "bar". If you examine it, you will find that it is the (Federally required) bumper.
Designers have been so clever at hiding them lately (compared to those beams hung out in front and back from back in the old days), that many in the US have forgotten that we've had a "bumper law" for, what?, 25+ years in the US; they STILL have a "5 mph. crash std." in the regs., though they softened it to allow some kind of "minimal" damage level @ 5 mph into the barrier, instead of none; but it's still there!
when you read about "Federalizing" European imports from the '70's and '80's, and having to mod. them to "meet the crash standards," that doesn't ONLY refer to the 30 mph. "barrier crash"....there's also the 5 mph. crash std..
I believe, but I could be wrong about this, the reason we don't hear much about guys "Federalizing' after-market EU imports anymore is that they've got substantially the same standards in the EU now; they also have one we don't have (yet

) that deals with pedestrian protection and how the vehicle will strike (and throw) a pedestrian.....doesn't seem to me like there's ANY GOOD way, but I guess the belief in science conquers all

PS: with prototypes, test and "show" cars, anything goes, but they CAN NOT sell them to unsuspecting John Q Public who might be injured or cause injury!!! they have to sign an agreement with the US Govt. when they bring them in that they'll export or destroy them within an agreed period of time.