After much waiting and work, my DB17 now has the Castle Creation 1717 installed.
The truck is geared 25/47 with the high speed idler and non-BP diffs.
When I had the stock 2200kv motor and 20T pinion, I was able to do 50mph on 4S.
With this 1580kv motor and 25T pinion, my top speed should be about the same. Just that I have a boat load more torque now.
I just finished putting it back together tonight so no running outside yet. But here's a quick teaser video on 4S.
Vid on youtube