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Its substantial. The catback i used previously was an Apexi, with pretty bad bends, very large resonators, and a very large muffler. It also didnt have an x/h pipe. I went from megans with Apexi to SZ 3in and Apexi, felt a significant difference. Then finally put the full SZ catback on, and felt another increase at the midrange/top end, although not as significant.
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