i know this may sound stupid but i have no idea what kind of battery would fit in my 240sx(sr20)...cuz like after i got my new headunit my lights already started to dim from that...and now that i got a 12 in my trunk, my car doesnt start...i had to jump start it twice already...does everyone get a new battery when they get subs? if so what kind and would it fit?

 

Sounds like you have a crappt/old battery. Get a optima battery quick.

I like the 51(yellow) series. Does wonders