Looks like I might have a failed HKS 2530. Will confirm soon enough though. We are only 50% sure.
Anyway: If I have to replace them, I want something a touch more responsive - Would sticking the GTX2860 between the HKS2530 housings do the job (machined front covers of course)? I'm not too worried about top end. Car is mostly for street / track work. It's a stock RB26 at the moment, set up for E85.
Otherwise, I'll just throw in a pair of new GT2860 cores.
I've read the entire thread but people seem to be talking more about the GTX2863. Sorry if I have missed something .