What are your goals? Peak hp or instant boost. Peak hp are great from Centrifugal SC's suck as Vortech, Procharger, Paxton, etc. Instant boost, great for off the line low end power is Kenne Bell, Whipple, Saleen, etc There are many out there and a lot of guys on here will give you an idea which to go with and what's good but you have to know what you want.
2003 Mustang GT Fobra, Sonic Blue 4R70W
400rwhp/382rwtq - Mods in profile
Tuned by All Out Performance
2001 Mustang V6, Oxford White 4R70W
Mods in profile