I'm going to tell you the same thing Ted told me...with an auto, the PD blowers will do more instant torque. A Centri will make power up top and not take away anything down low...also, easier on parts.
IMO, Whipple, Vortech, or ProCharger. Pick from those three. You want to drag race a lot...do a centri. You want something easy to install and less lines to deal with...do a centri. Ted's mail order tune is spot on with my car. I'd recommend Whipple or ProCharger and just get it from Jannetty.
2014 GMC CC Z71, 2009 C6 vette
2010 Camaro 2ss/rs---SOLD 4/15/14
-654whp with a few cosmetic things, Pfadt suspension, Vortech, CircleD, GPI ss3 vvt bump stick, gears, stuff in between,18" TSW N'rings for drag duty, 20" Forgestar F14s for street.
rhino@ Gwatney Chevrolet/GPI Jacksonville AR
TCAudio in Benton AR