After getting rid of all my Mustangs(07 Gt500-intake and exhaust, 03 Mach1-with a vortech SC, 97 Saleen-turboed) a few years ago to adopt a kid, I bought a 2013 GT yesterday. Unfortunately it is in another state and I don't have the time to do a road trip, so I have to wait the couple weeks it's going to take to get here. I'm more into drag racing than track racing and have read a lot of good things about the A6, so I went with the auto. So While I'm waiting for it to get here I'm getting all my mods ready and I'm trying to decide what power-adder to go with. It seems like a twin screw would be best with the A6, but does anyone have any experience with a centrifugal blower, or turbo on the auto, that can give me an argument for those? This is my first auto Mustang so I'm interested to see what will run the best. I'm looking for HP in the mid 600's. I'm planning on new header's haven't decided to go long tubes or shorty's yet(mainly waiting to see if I decide to go turboed) and full exhaust. Thanks for the pointer's I've been looking forward to being a part of the mustang community again!!