My .02, like Trey said, F1 or go home. If you prefer Vortech's, stick to atleast a J-Trim or a Ysi-Trim. A smaller S-Trim or P1-sc is a good blower but a PD blower would dwarf one of them. A lot of people have gone to waste-gating the bigger centri blowers. Using a smaller pulley to bring it up in to boost quicker then bleed off the boost at a desired setting, in turn, giving you a 'turbo' power band, atleast similar.