Exhaust Headers and Mid-Pipe Breakdown

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{mosgoogle}The first thing you will need to decide on, is whether you want catalytic converters or not.  In general, a catted mid-pipe is designed with one catalytic converter on each side of the pipe, this replaces the one or two cats found on each side of the stock H pipe.  The cats that are used in aftermarket mid-pipes are what they call high-flowing cats as these are less restrictive than the stock cats.  These pipes are typically street legal and will allow you to pass emissions tests, though you should check your state’s emissions laws just to make sure.
 
An off road mid-pipe, as the name implies, is not intended for street use, as there are no catalytic converters on the pipe, thus these pipes are illegal in all US states.   Although many people use an off road pipe (one without catalytic converters) for just that reason, off road racing, and then switch to the stock for emissions testing and daily driving.  These pipes will free up the most amount of Horse Power because there are no restrictions in the pipe.  These pipes will also cause even a stock car to become considerably louder.  The sound tends to be hollow, and you will typically smell unburned fuel in the exhaust gas much more so than a pipe that has catalytic converters.
 

Categories: Mustang Tech

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