39t ring steel ring gears for the front and rear diffs are essential. the kit ones will wear out in no time.
Also get the MTX-3 ball cup ends with the delrin inserts to tighten up the suspention movement
Havent got the front and centre conversion yet but next on the list.
The front conversion will help a problem at the front. If you catch a front wheel in a bump the top suspention pivot will bend back to add toe out as there is nothing to support it. The front conversion adds a bar across the back between the uppr pivots making it stronger and able to keep the front settings in a crash.
The centre conversion increases the internal drive ratio for more top speed.
Cheers