Thread: Do i need a retune on ess supercharger w/ stock cats?
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      05-15-2017, 09:23 AM   #9
johnnydg
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Drives: e92 m3
Join Date: Jan 2013
Location: Dallas, Texas

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How much power loss will happen just from adding back the cats? I have a ESS 595 kit with eisenmann race exhaust.
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