Well after intense research, I finally found a new STI-R for sale.
So now the question is where I mount the antenna. My grill is plastic (M3 coupe), so I figured that was the best spot. Then I read on a 9500ci thread that the optimal spot is higher up on the inside on top of the windshield. It gave much better reception as opposed to behind the grille. Being that the car is new, I'd rather not cut the (lower) grille. Plus if I do that, the mount will be even lower than behind the upper grille perhaps compromising performance?
One setup I am seriously considering is between the rear passenger head rests. Just lay it on the deck above the center arm rest. It's not as high as the windshield, but higher than the front grille. I would cover it with some sort of mesh cover they use for speakers for stealth apperance.
Any thoughts on this? I attached a pic to give you an idea.
FYI. As far as laser reception, I will also be purchasing a set LI's and perhaps the Cheetah wireless bypass system. So as long as the LI is picking up laser, it's not that imperative on the STI-R. It's mainly for radar reception.