Aluminum Heads

Do these other heads (promax, sidewinder, etc) Still give a dang good gain? I really cant afford the trick flows but can one of these others, but don't want to if I wont see much out of them..
I’m sorry but you do not understand the repeated question after I repeatedly gave you the answers and information needed to decide. Therefore, you must be ******* with me and I now remove myself from this thread.