optima red top
 

will this battery fit in the crx with a d16z6 motor?

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Sorry, I don't know how big the battery is, but anything can be modified these days. Hell, if it doesn't fit under the hood, you could always locate it to the hatch. Don't know where, personally, but I've heard of it being done.

The optima batteries are big. Too big to fit in the stock location on my 2000 ex. I believe on the CRX, you should be able to get it in there. Might have to move a thing or two.

the red top will most likely not fit your best bet is to move to the rear hatch, nice thing about gel cells is you don't need a sealed box for the battery, and you get a nice amount of room to screw with in your engine bay.:cool: