Originally Posted by Philip@McKennaPerformance
I'm predicting that if the new F80 turbo M3 comes with 450hp or so then it will be able to hit 500-550 with just full bolt on's and a tune. If you pickup the VF620 kit then you should be able to still eat the F80 M3 for breakfast, lunch and dinner.
550 HP with basic bolt ons vs VF620 kit is not apples to apples.
If you throw in larger turbos and intercooler upgrades and everything else that can be done to a Turbo motor you will likely easily be in the mid 600s for the F80 M3.