I have the Banks Pedal Monster and love it............. 🏎
Like you mentioned it doesn't add any power but it makes my Corsa exhaust sound awesome :rock:
If you have a Napa Auto Parts in you area these are very good batteries made by East Penn Manufacturing:
https://www.napaonline.com/en/p/BAT9894R?ir=1&r-src=BR:PDP:SP:Aboveproductdescription&ppid=BAT9849
https://www.napaonline.com/en/p/BATAUX14
On the coldest months of winter I use this CTEK charger and it has worked very well since it is made to handle very cold temperatures and hasn't let me down knock on wood lol
https://www.amazon.com/CTEK-56-958-Automatic-Extreme-Climate/dp/B00GODCLYU?ref_=ast_sto_dp&th=1...