Best Supercharger Choice?

The only advice I can give is that you do your research on the different types of superchargers and their pros/cons. Decide what the goal for your car is....just a fun daily driver, a mix of street/strip, or just looking for the 1/4 times. Building a car just to hit a specific HP number is pointless

A Vortech S-Trim, just as an example, with a 3.60 pulley and everything it comes with stock (36 psi injectors, mild tune) on an other wise stock 4.6 PI engine, should get you from the stock 260 hp to approx 390 hp at the crank...or about 350 hp to the wheels give or take. That is at about 8 psi. Now on a stock internal 4.6 2V GT, you can push it to about 10 psi (smaller pulley) or even 12 psi absolute max but 12 would be pushing it. You're safest around 8-10 and at about 400 to the wheels. Other supporting mods (intake stuff, exhaust, stage 1 cams) can get you to 400 without you having to add more boost. But that same blower, the S-Trim, is capable of pushing over 15 psi. Once you start getting into built engines, you can then start to pulley it down or even go with a bigger blower like the T-Trim or YSi-Trim.

NRB Auto said:

For the 600WHP Im currently working on, Im curious what supercharger would be the best bang for the buck along with some other s/c related questions. First of all when a site gives you rating such as increase from 260hp to 390hp. What will that be referring too? Max output of the s/c or just general 5-10psi. Also how do I know what is compatible for what im looking for? For example, lets say I go with one that says the 260-390. Can I safely push them much higher in psi?

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You won't get to 600 whp for long with a stock bottom end.