I only suggested a fast servo because the expensive competing belt car owners will probably use fast servos in their car, and I did not want any tc4 racer to be at a disadvantage!!! My philosophy in rc racing is put quality components in your cars and you will be amazed what it can do.....Also I have realized that many people get tired of the tc3/tc4/ntc3 not performing like the newer kits out there, but refuse to put quality parts in them!!! Almost all the tc3/tc4/ntc3 on youtube are RTRs!!! Where I race, the competition is very stiff, and just any servo won't do......