Yes you will. Like choppersrule stated above:

EFLH1110B - 370 Main Motor with 9-Tooth Pinion (Included with Aerobatic Enhancement Kit [EFLH1168]):

For use with 3-cell Li-Po packs and flat bottom main blades for hovering and sport flying, with less duration than when using the main motor with 8-tooth pinion. Also for use with 3-cell Li-Po packs and symmetrical main blades for sport flying and aerobatics. Must use a heat sink (EFLH1132, also included with Aerobatic Enhancement Kit).

We suggest 860–900mAh packs for all-out aerobatics with durations up to 15 minutes and 1200–1320mAh packs for basic aerobatics and longer durations up to 25 minutes or more.

Click on this below:

[link=http://www.horizonhobby.com/Products/Default.aspx?ProdID=EFLH1168]Aerobatic Enhancement Kit [EFLH1168][/link]



Crash B.