Quote:
Originally Posted by MrSir
i wouldn't worry about the CEL most good quality HFCs usually have a second slot for the O2 sensors, which is there exactly for that reason. So the likeliness of getting a check engine light is very low. Its much higher with Test Pipes. Which you shouldn't really be running anyways on public roads.
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Most aftermarket parts are sold with a disclaimer.
Sure some HFC
MIGHT PASS and say they will, but not all HFC are "street legal"