Quote:
Originally Posted by john98ssfbody
If you install the complete system with all the o2 sensors in place, you should be OK. The system shouldn't set any DTCs at all. While a tune will optimize the headers it really isn't necessary.
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WRONG long tubes will throw codes regardless. I have their full system and the o2 sensors are installed and it was fine for 3 or 4 days then check engine like came on. Longtubes will require a tune to remove codes to pass inspection. And as others have mentioned a tune will also maximize their power and efficiency.