Are you going to drive around with 100 octane in your tank often? I would find it impractical but if you feel like paying for it then their is definitely a great benefit in power.
a lot more lag thoughHaven't looked to find the answer yet but another things comes to mind and that is investing in a slightly larger turbo that will more easily reach those numbers on pump gas alone (not needing aux or w/m). If you add up the cost of of going w/m or aux fuel - wonder how long before you start to break even with just selling your 2867 and getting something larger. 3071 maybe? I'll have to look into it myself as I'm curious. But I want to say that may be a route.
Yea I didn't want the lag and 420whp is all I want in a daily and I figured thats in the wheelhouse of the 2867R. The water meth i dont feel is as safe and would rather go the port injection route for a couple hundred more..