These are the three most developed formula libre track cars of the current era, hence the comparison. I think the track versions of the Valkyrie might have the potential to be lighter and more powerful than the 919 Evo. Would not be surprised to see prepped versions of it contesting the 'ring and Spa records.
Valkyrie AMR Pro
~1130 HP (road version claimed 1130 hp)
<1030 kg (road version claimed 1030 kg)
849 kg (888 kg including driver ballast)
The ID R probably better suited to Goodwood, Tsukuba, Pikes Peak.