5 Cell with brushless motor=Fast. Like they said going slow is fast. car is very drivable with 5 cell you will notice the car will will be alot faster on the sweeper and all the slow section on the track. You will loose a bit of top end speed on a sraight if your running on a big track but this is not a problem if your running on small track. If your running 13.5 or 10.5. You need to gear it at around 4.7 - 5.1 it depends on how big the track. A lot of guys tends to gear higher but you will not really gain any extra performance out of the motor other than heat..... And this will hurt your motor.
At my area I'm the only one who runs 5 cells. A lot of guys still can't beleive how fast my lap time against 6 cells and I always manage to TQ and win races on both expert 19T AND STOCK class. Here's our website.
Click on the race results and my name is kim. You will also see my lap time on the 19T expert and 19T sportsman class which I run 13.5 motor. A lot of people is skeptical running 5 cells but one's you tried it they are not bad and not to mention less wear and tear on your electronics and your tires last a lot longer.