No one can nail a definate number for you but I would hope a 2-3 tenth increase IF everything else is up to snuff. In my case I fully ported my heads plus my intake was opened WAY up to kill any restriction or choke point that some intakes have. I picked up just shy of .02 but I know there`s a bit mre there............either way, you should feel/see a nice difference as long as you hook.