For $265 you can monitor how fast it's spinning. 6 mm drill bit and some wiring... even comes with a pre cast spot for a sensor from Borg Warner. WHY don't people want this data baffles me.
They're journal bearing. Waste of time.
if you could believe the HKS propaganda And look at those graphs, run some SS's/-9's at the same boost.
How much are these overpriced nuggets?