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TECH SPECIALIST
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Neither will have a difference in performance. I would expect the 4” to be a tad quieter. Less likely to drone. But I’m sure drone can be removed from both.
any change in flow thru the motor will result in a change in performance... whether it is detectable by the SOTP meter depends on how big the change is. When I straight piped my cat and did the 30" magnaflow muffler I immediately lost low end torque along with ~1.5 mpg. It stayed that way about 4~6 weeks.
 
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