FYI ill correct a few things in regards to your post... It's "Hypergear" not "Hypertune", hypergear make turbos, hypertune make plenums...
Also the photo of the turbo you posted is NOT a highflow. It is a hypergear turbo running a ATR43 rear housing and a standard nissan front housing!!!
but yes, hypergear turbos are cheap, australian made and seem to make good power and response