It's hard to compare different dyno charts when they haven't been on the same dyno and comparing 2 different engine responses is hard when you don't know what setup they use.
I know this is and old thread (from 2013) and it's in Swedish, but here's a S54 that's been runing 1130 WHP for 3 years and more than 10000 km's. Engine haven't been opened, only regular oil changes. Weak block?
http://server.pure-pf.com/phpBB/view...5621&hilit=s54
Thread about 2 S54's that runs over 1000 WHP and they are no dyno queens either.
http://www.r3vlimited.com/board/showthread.php?t=325046