I correct myself , your statement is true in select markets the for the usa your totaly correct but . vti cars vary greatly between markets it really depends where its from and what body code the cars is , eg ,ek ect. vti can be found with anything between a d15z to b18, i have even heard of but never seen d13 vtecs. but i am correct for where i live en ex here is a single cam car as are all vti i have ever seen ,, and all eg sir are double cams , and truely sadly 99-2000 ek Si are all single cam autos