One advantage of the air/water system over the air/air that I have not seen mentioned is the ability to use the on board A/C system to chill the coolant so that you can get IAT's below ambient. C02 also gives the same result but needs to be refilled.
Also I saw someone mention that ESS uses an FMIC, FMIC's are used with air/air and from what I know the ESS kit is not air/air.
As for the bearing issues, I have been trying to find out more but I suspect that an oil with a high ZZDP pack like Valvoline VR1 would make the bearings a hell of a lot happier.
03 325i - Daily Driver
05 GTO 750 RWHP - For Sale
09 e92 - Pending purchase.
Last edited by ArthurJGuy; 12-24-2012 at 12:06 AM.