How can I tell if my turbo's have ceramic or metal turbines without taking them apart. Someone once told me that the ceramics spool-up quicker, is this true and would I be able to tell? My car is an R33 GTR and it's been running 1.2 bar of boost ever since it came over from Japan. I know this is over the top for ceramic internals which is why I am hoping they are metal. I just need a bit of reassurance!