Thread: Do i need a retune on ess supercharger w/ stock cats?
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      05-14-2017, 03:06 PM   #3
SVH
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Drives: 2016 328i & 2011-e93 TT
Join Date: Jun 2012
Location: Long Island, NY

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What ess kit you have?
625 and 650's recommend HFC's. Might want to inquire about that. Lessor kits shouldn't make any difference in the tune.
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