I had my 2009 tuned by Slowhawk Performance and it put out 450 on the Mustang Dyno. They said it has a Lingenfelter cam, heads, Kook long tube headers, Corsa exhaust and other sundry mods. Still idles rough, but once warmed up it is easier to take of in first gear. Also seems to run smoother, but still doesn't like anything under 1500rpm. I am trying to feather acceleration, but at any speed in first gear it breaks traction if I push it, if I run out to about 5000rmp and shift to second gear it will still break traction if I push it. If I am in second gear going about 3000rpm and push it, it takes off but still has some slippage, and may even break traction at 4000rpm. It has street tires I know, but I'm just trying to feel out what this car is capable of. We have some great straight back country roads in Mass, but the pavement is still cold and that could be part of it. Advice? I love it.