Here's a writeup for Supersprint's muffler. Interesting that they make the exact opposite claim:
"The factory one-piece muffler system has a complex design, which includes a built in flapper valve on one side of the system that has the sole purpose to alter the sound note at certain pre-set rpm levels. This design reduces performance at low RPM. Supersprint rear mufflers alone increase the torque and max hp by a significant amount, especially at low rpm."
Will be worth testing this out!
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