Yes. auto tranny cam have lower profile compared to manual's. I once had my engine detonated, i got another engine. I have no idea where the engine came from since my mech ordered it for me. If i'm not mistaken, its from a DA6 , becoz the auto tranny's engine (B16A1) only come from an intergra. After the second engine swap, i hardly feel or hear any vtec kicking in. Then i change my cam to ITR's. Took out the previous cam...just to find out that the cam is of an auto tranny's engine ( of coz i also found out that the engine had only single valve spring on both the intake and the exhaust side, compared to the normal manual B16A's which have one side dual springs on the intake and single on another) The auto tranny have onlye single valve springs . The auto tranny's cam had quite a big difference compared to the auto tranny's (in term of power and VTEC singing sound) , also, u feel the power starting to flat out at higher rpm. Most probably becoz auto tranny engine wasnt meant to rev that high (for example 8000rpm). The Auto tranny's engine also have a lower redline.