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Message: <blockquote data-quote="B.mad" data-source="post: 1314323" data-attributes="member: 19482">yes you are right it is for EPA and quieter exhaust. And as far as running true duals vs crossover, it really depends on the who you ask. Drag cars run "true duals" and they go "balls to the walls", but they also have high horsepower applications, launch at 6000 RPM, and have a really high (numerically) gear ratio. For a street car, a crossover is a better benefit because itll give you back pressure and give you low end.The way i was toldopen headers=low end sacrifice for high end powercrossover= low end power for high end sacrificestraight duals= i am thinking a combo of the both.</blockquote>