The engine has great knock control, and has a lot in reserve mechanically. I have been told the motor can rev well over K easily, I think Mac have been pretty conservative with the engine in the name of reliability for their first "production" car. Again I'm not huge on spending thousands on mods, until i can drive well enough to maximize everything the 12c has to offer, i don't need any more power. I think i would rather spend the cash with McLaren SO and have them do the mods for me.The mods will happen for sure. I speculate that anothe 100hp could be gained form software alone but there will be significantly less headroom. Especially for those that can only use 91 octane. On the road it will likely not be a problem but on a road course it could cause some issues. I assume the car has a good knock control so it won't blow itself up. If you start changing hard parts you will certainly move the power curve and induce lag.