Swapped the HKS down pipe for the stock one to ops check the o2 sensor. Cars seems to be back to her good ol' self, so right now I'm ruling that as the problem. The DP had only been on the car since the 6 speed swap and I'm guessing the flogging at autocross finally killed it. We shall see if the problem resurfaces. I did change MAF's, TPS, and was going to swap crank sensors had the o2 sensor not been the case.
Def going to look into that coolant bypass thread though. Who knows, might be something worth doing. I did pick up a metal coolant resi from a buddy of a 205 so possibly in conjunction with that.