Originally Posted by HREM3
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.
Larger turbo upgrades won't be available for a while. Heck even tunes may not be available for a while due to the time needed to research, develop, crack BMW's systems.
I think it's a pretty fair comparison since the E9x owners already own the car and for them to get the F80 they will have to drop 10-30k on top of their car to get the F80. So for that amount of money they can instead go with a VF620 kit and save 20k while still beating a stock F80 M3 easy and even a modded one. Most likely 550hp on the F80 would only be seen with down pipes, mid pipes, intercooler, air intake, methanol injection. Sure 600+ can be achieved with turbo upgrades but that will be pretty far away.