>I was checking out http://www.superchargersonline.com
and saw that there were 2 variations of the renowned YSi-trim. V7 and V24.
V7= -Fits engines up to 1250 horsepower
-Maximum airflow: 1600cfm
-Maximum boost pressure: 30psi
-Maximum impeller speed: 62,000
-Adiabatic efficiency: 78%
V24= Modular, extremely robust drive
4.25:1 internal step-up ratio
Unprecedented strength and durability
Fits engines up to 1,200 horsepower
Maximum airflow: 1,600 CFM
Maximum boost pressure: 30 PSI
Absolute maximum impeller speed: 65,000 RPM
Adiabatic efficiency: 78%

 

>and there is a difference of about $100.00 V24>V7

 

its actually the V-27...this is from vortechs website...
The V-20 series supercharger brings new technology in the form of a modular, super-robust drive system to meet the abuses found in the high-powered (1,000+ HP) segment of drag racing.

It looks to me like a stronger case and drive end, but i doubt itll fit the s and t trim brackets like the v7

and the difference between the 2 is more like $1000.00