2015 chrysler 300s battery posts

[barkingspider]

So i plan on hooking my rockford t2500 amp to 

Push 1 l7 15 with it seeing only 1000 watts. So my question is it safe to use the factory ground (showed by the red arrow)? Also, how can i attach my power wire without having to change the original power wire terminal on the car? It seems super cramped and im not sure i can get a solid contact for the amp power wire 

[liteblue]

For the ground i would use the bolt directly on top the battery cable not chassis for grounding. for +12v post tho you are going to need some kind of adapter.

 

Knukoncepts makes the "ultimate battery Terminal" it has locations to clamp onto the factory battery terminal and add a foctory style post to the side for your oem +12v connection.