The x-trim is roughly equivalent to a novi 2000, but you can't get that in reverse rotation, so it won't go on a mod motor. The largest vortech supercharger in reverse rotation is the t-trim I believe.
The Novi is getting ready to make over 700 rwhp on a 2V car that T&J built and the JT is getting ready to do the same on my car.
If you'll remember, when the Novi was first introduced it was meant as a race blower so it's plenty strong enough and Vortech classifies the JT as "race only" as evidenced by the data plate on the blower.
Both can cram well over 25 psi (not sure of the exact #) into the motor if properly done. In terms of blower speed I don't know the exact limitations set by vortech or paxton but I'm sure it's at least 55K rpm with the usual "we didn't tell you this" 10K rpm cushion.