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I dont know about cars and just got my first stang and was wondering about the difference between legal performance parts and off-road parts. For example im thinking about buying roush exhuast for my v6 mustang and realize i have two choices, either legal or off-road. Both are the same price.Does the off-road exhaust sound way louder?, therefore making it illegal on road? This goes for all other off-road parts also, I mean shouldnt the off-road parts cost more if they perform better?:headscratch:
 

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The o/r pipes will be much louder than the legal pipes. O/r pipes remove all of your cats. If you have to pass emissions you can buy a midpipe with hi-flow cats. You won't pass emission inspections with o/r
 
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