If I had a M/T I would have gone with the CJ setup. I may have been mislead, but it was my understanding that its sometime difficult to get an auto car to shift in the higher rpm range. With that in mind I just felt the CJ setup was a pretty big nut to drop if I wasn't able to get the car shifting at the proper RPM to take full advantage of the manifold. I didn't research too in depth about this either since I most likely will not finish out this season N/A