yeah 16hp on a 300hp motor is barely noticable.
it's really hardly noticeable. do you think you can notice a 5% increase in power? I sincerely doubt it.
We can do a port and polish on the head and a 5 angle valve job...
You can be the first Speed 3 with one...
http://www.mazdas247.com/forum/showthread.php?t=123666725