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Message: <blockquote data-quote="r3dn3ck" data-source="post: 327553" data-attributes="member: 9214">As long as the motor is from the same model year or newer and you retain all the stock emissions equipment for that motor it's entirely legal. Since the modular engines are all the basic evap/pcv/egr/multi-cat setups it's pretty easy to comply legally. Anyone who says it's illegal doesn't know cuz I know for damn sure it's legal if done legally.Second, it doesn't matter if it's legal. It's almost totally indistinguishable from a 4.6. You'd have to be a mad-dog blue bleedin' mustang guru to notice. Last, it's pretty stupid easy to get a hook-up on smog. Only tards and the lazy can't manage it.5.4 went PI in 00'. 99 and earlier are NPI. 4.6 and 5.4 heads are the same heads for our purposes. It doesn't make a damned difference if you use mustang PI heads or truck PI heads or mustang NPI or truck NPI. The only thing that changes is valve covers.As for what cam... if you bother with a cam, then you should also be bothering with a set of ported heads and longtubes. There's no such thing as a 5.4 mustang that's a slug. They're all spankin' ass fast. Some are really stunningly fast.</blockquote>