What coil are you running?

I am partial to think it is either the module or coil and it will really only cost me the price of a coil and an hour or so of my time to test my theory. I have everything but the coil already and that is why I was wondering what kind to use. If it still acts the same after using the chrome box, then well... I suppose the car will be shifted at 5800 rpm.
Maybe my e-coil is the issue and not the module. I dunno, just want to try some experiments.
Thanks!