The vehicle in question has the RPI headers, RPI exhaust, and the RPI oil cooler. 576 wheel on a dyno dynamics is pretty good although this not in shootout mode and compared to other dyno dynamics numbers BimmerBoost's experience with RPI's Dyno Dynamics tells us it is corrected quite a bit. To remove any speculation we would like to see a dyno in shootout mode but since that will not present higher numbers we will not see it. This setup would yield over 600 whp on a dynojet though which we are fairly certain of especially considering a stock M5 puts out 390 whp on the RPI dyno and a stock M5 puts out around the ~420 range on a dynojet.
That would mean a rough estimate of 621 whp on a dynojet. Not bad for what we would guess is a high boost and high octane setup on the stock motor. If the kit was using something larger like the Vortech T-trim, these results would be more impressive on the V10 especially versus T-trim E9X M3's which have cracked the 600 wheel mark.