Unless you ship your car to Specialty Z, no matter what, with that amount of power you need a custom tune. If you go with Haltec then you get rid of the translator, the two MAFs and boost controller. As for the transmission, automatic would be my choice at the strip but these are your only option: Specialty Z's built factory automatic transmission, flex plate and higher stall torque converter, leader gears differential. If your car is 5 speed from the factory Chevy automatic transmission with BDE adapters. 4L80E if they have it already. PAR dog engagement gearset. Helical for noise reduction on street driving. Racing manual transmission.