I have installed the Whipple and the Magnacharger on the H2, and drivin one with a Vortech. Without a doubt, the Magnacharger seemed to be the most powerful. Also doesn't void factory warranty and is by far easier to install than the Whipple (Whipple seems like a "hack" job). Just be sure to also get an Airaid intake with headers and full exhaust (I would recommend the Corsa system).