In one season '03 , i saw 2 T3 equipped racecars blow the turbos apart at the join of the core and the exhaust housing .Neither had DV's , read into that what you like ! Ive blown several turbos in a long time of cosworth ownership a few T3's without DV's and a T4 with !
I sit on the fence on this but i now use one , as do some of the quicker cars you will know of !