I might race you sometime soon.
Haven't played GT5 in like a month or more so I need to practice a bit.
Also that picture is a few months old. I got the V10 5.2 R8 a while ago and tuned it fully but the one in the picture still beats the stuff out of it, except in a drag where the V10 can pull out just a tiny bit ahead.
On the speedway track thing I've gotten that R8 up to I think 340kph, 211mph without any transmission reconfig from my technical track racing configuration.