i don't know if this has been brought up here yet. i've been seeing these things on small to medium size diesels. the concept of it is pretty cool that there is a nozzle that adjust on low and high rpm's and help reduce turbo lag on big AR turbos. i don't really know what actuates these variable nozzles yet. maybe some kind of vacuum or something electronic?....any way we can integrate this to our homemade setups

 

http://www.thedodgegarage.com/turbo_vnt.html

 

According to the article, the guy needed to add an actual wastegate to his setup to control overboost. But apparently the VNT worked very well in lower load conditions.