Funny I came across this thread. My best friend actually has an 07 roush stage 3 and I've ridden in that car numerous times. Much better overall car than the gt500 since Roush goes through the trouble of changing pretty much everything from the standard mustang. It's rated at 415hp and 385tq but I definitely think its underrated. Feels more like 450hp/420tq. We always talk shit between each other at who's car is faster. Right now I'm pretty sure he'd beat me but I think I'll take him once I go FBO.
COBB / AR Downpipes / ER FMIC + CP / AFE Stage 2 Si / Forge DVs / HKS Exhaust