Owned ms6 prior to the z, and at this point in the game speeds are going to be ones to look out for. they are starting to make big power , and a buddy of mine just went 12.2 @ 114 in his speed6 with a gt3071
I raced a 09 370 in my speed which was good for probably 12.8 ish and burried him from a roll...needless to say I now own a z
There is also a Russian guy in the Ukraine who went 11.2 gives you an idea of where they are headed .
http://www.mazdaspeedforums.org/foru...3-126-a-86049/