i think there is a stock ground infront of the valve cover, closer to the left front of the car
you can always make your own
i have a few in mine
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
the front battery is grounded 3x's
got two ground going off the engine block
mine is an over kill tho, but it the long run what your trying to do it make everything flow smoothly, it keeps the voltage steady aswell