I recommend going the HARROP route. It's a low boost positive displacement blower with a liner response and low down torque that's somewhat missing from the centrifugal blowers in my opinion. Mine's been installed for ~50K miles and beat on pretty hard. It makes the S65 'think' its a V10 and because of the low boost it's probably a little safer for the S65 (if there is such a thing with the boosted S65s). Anyway, the Harrop blower design has been put through it's paces at the Ring which is a good test of endurance and reliability IMO. Even though it's low boost (~6.2psi) it moves a high volume of air into the motor. Hence the torque at lower RPMs.
https://www.m3post.com/forums/showthread.php?t=1070943