2007 Precedent 10mph bone stock

SN# pq0721-760831
1 year old Trojan 12v x 4
Does not seem to have regen braking working at speed. Will beep if pushed from a stop. Cart was a personal cart and is in very nice condition.

Looking to get 20 mph from this cart. I have looked over the forum a bit already and raised more questions than answers for me (newbie)

Will just a magnet get me there?
CC reprogramming?
SPEED CODE 5 PROGRAMMER?
Bandit mtr?
Do I need to check pedal sensor or speed sensors out?

Thanks!!

I would like to keep the cost under 300.00 if possible.