Since i'm lazy and dont feel like searching tonight. Has anyone upgraded their battery to an AGM battery of some sort and what size/group did you go with? How well did it fit in the stock location or was there modifications needed? My stock battery in my '08 coupe took a **** finally after a few years of sound system abuse and i'd like to just put a good one in instead of dicking around with an OE replacement.

 

I put an XS power D3400 in mine. It fits in the stock location pretty well. I wasn't able to use the plastic wedge that holds the stock battery in because this battery is wider. But the nylon strap still tightens down and holds the battery in very well. I've had it in since December and no problems.

 

I have an Optima D75-25 and I'm running +/- 1000 watts RMS and no flickering or anything. No modification to anything