VSracing Next gen 7875 billet

What is the difference, they're all a 7875.
The billet gen2.5 7875 has a 7 blade 78mm inducer 102mm exducer compressor wheel, and 82mmx75mm 10blade turbine wheel.
The next gen billet 7875 turbo has a new high flow point milled 6 blade compressor wheel of the same 78x102mm dimensions, and a higher efficiency 9 blade 82mmx75mm turbine wheel.
In the same size, this squeezes a little more efficiency and a little more airflow capacity. At moderate boost it starts making more horsepower per pounds of boost, and at elevated boost levels it out performs by about 100hp. One of the best spooling while simultaneously rivaling power production of many S400 based turbos available.
Recommended with the 1.25A/R divided T4 turbine housing.