I'd say that the 4wd corr trucks will definitly make the 550 motor sizes important going forward. Would certainly be worth while for Novak to pursue.
Another option that is currently out there for the 550 size motor is the trinity Duo 550. They have 4.5, 5.5 and 6.5 motors for around $99 and are in stock on amain.
I can't decide if its more fun
to make it...
or break it...