Board Thread:General Discussion/@comment-86.31.115.168-20150821095235/@comment-34804319-20181130181805

The difference is the 4.2 model uses a naturally-aspirated V8, while the 5.2 model uses a naturally-aspirated V10. VAG doesn't currently make an engine with 6.2L of displacement, though if they shoehorned the big 6.0 W12 from the Bentley Continental into an R8 that would be beyond awesome!