drift does see some large rpms sometimes... its always handy to have a few more rpm to extend the drift cause not every situation you are able to change up. changing the diff ratio doesnt always help either.
i am looking at building an engine as a spare over a period of time and im just looking at ideas to what i can do with it. sure i could just put forged pistons and rods in it and be done with it but would be nice to go a little bit wilder on the set up. i do realise that this = money as well.
as roy said i think one of the biggest issues is going to be the overspeeding of the ps pump, alt, water pump etc which should be easily reduced by a set of reduction pulleys.