This intake works really well with the TFS heads ported and has a very nice torque band. Unported it is a restriction. I have this intake on my 5.0 Mustang right now with a set of out of the box Twisted Wedge heads. Tmoss will port the lower for around $100 so it isn't a restriction for the TFS heads. You can find Tmoss at most Mustang forums like the Corral.