I'm buying an X47R next week and I'm leaning towards keeping the stock WGA as I feel that perhaps it may be better to drive day to day. Just wondering what kind of power loss and difference in driving day to day I would see using stock instead of either a 7 or 11PSI Turbosmart WGA. I figure that if I dislike the stock one I can always just install a higher PSI one later on. Cheers!