Drive Shaft Question

[victory3]

Thanks on the tips for shedding weight, this car will see some track days, so she has to shed some pounds. I will for sure look into the flywheel. Most batteries by nature are heavy. Does anybody know, of a "light weight" battery being sold. Anybody else experince the Box getting a little Squirrely past 100-110mph? Dont really want a bigger spoiler/wing but may need one. Thank you all for all of your tips and help.

-VICTORY3