i run an 8.5 in mine and use a 24 pinion 83 spur, if you need more speed then use the 76 spur and you can go up to a 27 pinon but as always check the motor temp and esc temp, 80 degrees is the realistic highest you'd want to go although some will say different. one thing to consider is changing the boost settings to get you the top speed or punch out of the corners you require. i have run 24/83 with 35 dergees and it was as fast as an 6.5 which my friend has. hope this helps you.
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