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the standard servo is 23T, the Savox will be 25t, so yeah, you need either a new horn or a different horn insert. Myself I bought the TLR horn TLR1557 which is the wrong horn as it has imperial threads not metric. To solve that problem I just gently screwed, then backed off, then screwed, a...

what exactly do you feel the need to upgrade? I've done the tires, and the servo/horn. Very happy with the truck. I even race it now and then. It handles like a dream, I'm not sure what you would change unless you got into serious racing, at which point you may as well have bought a race kit.