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i cant put into numbers what gains you get from hollowing out the cat or using a test pipe, and yes this mod would do more in most cars than the s2000 but u know every little bit helps, and i do not have back presure issues, the apexi gt spec has a resonator, oh and is ur car breathing was well as its exhaling, u got an intake?, my big plans are the lovefab turbo kit but that after the winter
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