Sadly there are no tracks near me, except for touring cars, which I've never found interesting. So its only bashing for me, but I like my cars to handle well.
I tried the 580L 8L in the hyper ST today, it seems like a more powerfull motor than people give it credit for. My run was cut short when the rear internal diff-gears turned into a mix of silver shavings and diff oil

First time I ever had to replace a diff

Luckily the previous owner of the car had several extra diffs that I got with the car, so I fixed it quickly and now I am going to do further testing with the 580L.
I'll report back afterwards.
Thomas G