Out of curiosity, what kind of mods do you have and have you had the car turned after they were all installed? I've heard that a bad air fuel ratio can cause issues with cats.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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