And for hopups a one-way front diff, sticky diff covers and ceramic diff balls are worthwhile upgrades.
I have the aluminium steering bridge and mount. Don't think they are absolutely necessary although I have yet to experiment with altering the ackermann. This is probably more bling than outright performance.
The front aluminium castor block is not a bad tuning option. I find it works better on a smooth grippy track especially when using the short position. On a rougher track, you can run it long. But again this is not absolutely necessary
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