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Message: <blockquote data-quote="Jakespeeds" data-source="post: 1456720" data-attributes="member: 21192">Its all up to the air pump under the hood.  You might feel a little more power maybe.  You will probably notice the car will pull a little harder and for a bit longer before the power drops off.Exhaust at this point for you will probably just make the car sounds a little more rumble rumble.  You would need to do headers to make full use of an exhaust.  And even then the NPI heads and cams will be a stopping point.For the "legal" part consider a no cat X pipe then keep your factory midpipe around.  Its what I do here in California.  Just put it back on the car once every two years with the factory tune.  Everything else on the car is CARB certified.  But you will need a way to switch off the back O2 sensors with no cats.  I never had any luck with those plug in simulators.  Maybe you will fair better.  I do mine with a tune.Jake</blockquote>