I run a Futaba S9551 low profile one in mine which is probably overkill as it would cost more than the car if I had to replace it, but it was a leftover from when I ran a touring car. As it's mounted high up, I reckon it's a "good thing" to try to pick a servo that is fairly light so it doesn't add to the M03's inherent traction roll characteristics but at the same time have one that is robust enough to take all the abuse that is fed into to mechanism by the direct steering setup. I also would always use a Tamiya hi-torque servo saver spring (but not the plastic horn that comes with it - it's crap and snaps really easily) and the hop-up alloy servo horn. This firms the steering up and stops the car wandering all over the place, the kit servo saver is just too weak and basically packs up after a few races.
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