I put the technigold in my Hornet and ball raced it all, with the right gear on the motor it'd flip over backwards lol
I bought one for my RX7 Tamiya a few years ago and it hardly made any difference. Seems strange? It came new from eBay and was a bit cheap, maybe fake. Seem to remember the technigold being expensive when they were new back in the day.
Anyone remember the next motor up from Tamiya, Dynatech IIRC