AFR 165's emissions legal vs. non emissions legal
 

What the difference between the emissions legal head and the non emissions legal head? Does the non emissions head flow much better? They are listed at the same price. I know my car isnt going to pass emissions anyway so i figure if theres a performance difference go with the non emissions head.

thanks for the help

the non- emissions head isnt drilled for the EGR or air pump lines..