Ok. Been searching and found some interesting info, but not specifics. What is the difference between itr and ctr cams? Why do some say only use a ctr intake cam or itr intake cam together with stock b16a/b18c1 exhaust cam? also, if i went with which ever cams could i just buy an ecu or tune mine to advance timing? Whats the benefits of timing change anyway? My motor is b18c1 w p72