VGT (variable geometry turbo) is popular in diesel in OEM forms, we all jump to traditional turbos in the aftermarket. Diesels need lots of torque down low for hauling, we don't need that power curve, so we don't use vgt.
Not to mention, VGT turbos on diesels are usually sub 60mm, and have very little power potential. Our cars need 70mm or greater compressor wheels. If there was one thing from my diesel I'd like on my camaro, it'd be the compounds. Nothing like a 85psi of boost spoolin up