Originally Posted by 2SS45th
Not to mention, VGT turbos on diesels are usually sub 60mm, and have very little power potential.
This is not really true. Back in the 90s and early 2000s maybe, but there are many manufacturers in the medium and heavy truck industry using electronically controlled VGTs. Now I'm not saying they would necessarily work in our situations, but there are plenty of Large VGTs out there. Heat and packaging would be two major issues to contend with. Not to mention the fact that a VGT would add significant cost to any turbo kit.