Yea.....you can get an 8T pinion from horizon hobby as well.

One thing I forgot is that even with the 4100kv and an 8T you get soo much headspeed that if you have any lose links they will pop off and you will lose all your pitch in flight. It has happened to me twice, since then I have toned down my throttle curve and have replaced the links. Just something to keep in mind.