Well, I can't comment on all the performance options ( my motor is stock, and the one in my 05 Magnum only had exhaust and CAI). But the guy's on Horsepower TV took a bone yard 5.7, gave is a stock rebuild, dyno'ed it with headers and a self tuning aftermarket EFI and made 400HP. I figure mine should be close to that because, headers (sort of ) no cats, CAI, and Diablo tune. I would be extremly happy with that in my 2700# Dart, and getting 20+ mpg too.