I noticed the 6L was making like 100hp more than the old 7.3 The 6L has the VGT turbo. (variable vane?) The 7.3L do not?

I did notice alot of headgasket troubles and a few people complaining about the turbos.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R