A blow-off valve without diaphragm from the N20 engine is used in the N55B30T0 engine
Interesting.. !
I wasn't able to find any info on what turbo is used...but looking at the dyno charts provided it looks like the changes to the head and pistons and oiling allowed them to get more rpms at the top end in order to build more power so there is a useable 7k available ... .
