The 71.1 mm RS wheel is rated at 44 lb/min each.The 63 mm GTX wheel is rated at pretty much the same.
Gtx wheel is lighter, still has to get out of that peanut, small ass end. Cold side too big, hot side too small.
Go back through the gtx thread and Simon Haughton who did this exact combo regretted it because of heat issues.
A shiney billet wheel on the cold side doesn't fix the nugget rear ass end.
Can get in, can't get out, why bring more air in. It's farken stupid.
Trying to empty a bath with the plug pulled...but have a fire hose filling it up!