What are the differences in performance?
 

What are the differences in performance in the different OS v spec engines?

RE: What are the differences in performance?
 

Well, I think the current version of the VSpec out now is the VZ-B, but I do not know the exact difference from the -B and the previous versions. Mostlikely, minor improvements iin flow characteristics and maybe a very slight increase in the timing profiles.

Now, the top of the line V-Spec is the speed tuned, and that one will cost you a fair amount if you do buy it. It just about employs most of the racing tricks in it and it does have an aggressive timing profile. What the Speedy's timing profile is to the normal V-Spec's timing profile is? I do not know. But even on the Speedy, I bet there are modders in here who can make that engine still significantly more powerful.