I can say they definitely will not warranty the o2 sensor if they see test pipes, especially when the downstream o2 sensor bears the brunt of having no cats. I would install your stock cats if you plan on trying to get them to cover it under warranty as o2 sensors are not cheap!
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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