The F150 5.4 I did had a 2 piece plug from the factory. Here is what my fil had in his http://www.summitracing.com/parts/acf-sp515/overview/make/ford/model/f-150 Those are for the 3 valve head. The truck you did was 2004 or newer correct? Matt has 2 valve heads. Hell even the 3 valve heads are the same. You can interchange them all actually. That's what the modular engine design was all about. Curious, are the intake manifolds interchangeable as well, or are they head specific? They are specific to the heads, but the 2 Valve head had two different designs and you can interchange them, although they do not match 100%. The gaskets make up for it though. Also, each engine size will be a specific intake. The 5.4 has an increased stroke and deck height, so it takes a different manifold. There are companies that make adapters though to fit the 4.6 intakes on 5.4s. That might be one (of many, I'm sure) reason I haven't seen any TVS supercharger kits being offered for 2v/4v motors. There are several. In fact, both Roush and Edelbrock's kits use the TVS. And they will mount up to the Cobra base as well. I'm not too sure about the Kenne Bell, but most of the twin screw guys don't much care about an Eaton anyways. That's too bad. Not a whole lot of first hand experience, but the TVS units don't seem to scream like the KB/Whipple/M90/M112/M122 blowers. Obviously it's install dependent, though.