They are cnc port matched not cnc ported, I like them and they perform well on my coupe. Mods and times in the sig, no dyno yet. Keep in mind my car is completely smog legal with ac and all options. The afr's flow better on the exhaust side but I don't have the flow numbers in front of me. Muscle mustangs and fast fords did a test on several heads a while back and the afr 165's had I think 12 more peak hp. AFRs also had a little higher average tq and hp. They used the same block, cam, and intake for both heads, carbed not efi. Not much info but I hope this helps a little.
Wesley