which battery under the hood?

[select127 10+ year member]

ok fellas my stock batt. is working fine, never died on me but sometimes it would crank up a lil slower than normal. i wanna get either a red/yellow top but which model do yall recommend? i tried searching on the website but it didnt show for my car(01 I30). Im also running a stinger batt. in the trunk if that helps. oh and i noticed that my sub isnt hitting as hard as when i was running 4ga wire from stock batt to second batt, now that im running 1/0ga from batt to batt and grounded second batt. with 1/0ga as well, what do yall think the problem is? might it be that ground wire from first batt is still the stock one? or ground on second batt might need to relocate?

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[btlking 10+ year member]

do big three and put a red top up front

 

[lrgnation 10+ year member]

put the same batt under the hood and run a ground wire from one batt to the other.

 

[lrgnation 10+ year member]

put the same batt under the hood and run a ground wire from one batt to the other.

 

[audiolife 5,000+ posts]

yellow top dual purpose...there is a reason why optima doesnt warranty red tops for audio use. hear alot of people say "under hood isnt getting deep cycled..blah blah blah point is its part of the same circuit reguardless . key on key off same battery is in use! doesnt take a voltage drop to 12.5v for it to be "used by the system" either........