interesting, i just tested that theory on a brand new TD06-20G i have sitting in shed and not only did a pick up magnet not stick it actually was repealled from it,so thanks to john from UAS for that useless test.
makes no differnce to the fact the turbos on my 32 still stock, the housing are stock size and the numbers match the factory listings, neither pair appear to be modified and from the history i have on the turbos its unlikely that both sets have been upgraded and both sets made same power, within 3rwkw of each other 4 years apart.