I ran the fatduc controller with the LV cat delete without any issues. It actually ran quite well like that. May want to take the seals off your air bleeds and adjust as well, as this helped smooth out the idle to power transition on mine .
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2009 UGM GTI 4dr Turbo, APR ST1 93 EMCS, DG Panzer Skid Plate, Carbonio, Tig N/P Delete, Muffler Delete, City LEDs, Euro Switch, Vagged Silly, XY Fog/FTP.
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