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Message: <blockquote data-quote="Jakespeeds" data-source="post: 1474727" data-attributes="member: 21192">Daryl,  The amount of horsepower you can get and remain smog legal depends on if you are staying N/A or going with an add on like a supercharger or NOS.  Then its down to the components and the build.  Everything needs to work well together.  One of the restrictions you will need to pay special attention to is making sure it has a CARB EO# attached to whatever you use.  No the motor does not need to look plain jane to pass.  You saw my engine.  It passes just like that.  But everything on the engine has a CARB EO#.  Mustangs come with aluminum heads and blocks from the factory.  So that is not an issue.  You just want to make sure they have a CARB EO# or the aftermarket manufacturers name is covered up.  I have seen enough engine dyno tests to know cats really don't hurt performance it almost all cases on street driven cars.  I have seen tests of factory cats that did not hurt performance until about 5K RPM.  I have seen aftermarket (SMOG legal) cats that do not hurt performance at all.  So depending on your goals I would not be too concerned with the cats.Jake</blockquote>