Just got my Audi R10 yesterday, figured it will be my choice for the longer enduros.
No mods, did the Suzuka 1000 today (all dry, thank you!!) won by 10 laps.
Did the Nurburgring 4 hour this evening, 3 laps ahead of an Amuse S2000.
Decided now to use it next for Tsukuba 9 hour - I'll grind the Nurburgring to level up some, but I want something closer to the Amuse in performance to make it more fun. Just bought another 430 Scuderia & modded it - you can change the wheels & paint them - will see if it can do the business!
Best lap for the R10 for me on the long Nurburgring track (G27 wheel / racing hard tyres / TC 3 / ABS 1) was a 7:53, got 4 laps from each set of tyres before they screamed enough. Screwed up a pit entry at one point and it drove me through without stopping - weird - moral is don't drive in too fast!! Then had to do an economy run lap with shredded rears which was a 9:05
The R10 is excellent, people have complained about the engine note but it's got a nice growl and being a diesel it revs low so feels nice & lazy to drive - ideal for enduros!! Enjoy your car!!