Originally Posted by SoCal Cyco
any check engine lights with the headers? I have the megan downpipe and cat back exhaust and really want the headers before i go in for a tune.
Yes there is a CEL, because the catalytic converters are removed with OBX and similar headers. You will need O2 Sensor simulators of some sort if you can't live with a CEL. The car does not suffer from any issues and runs normally without catalytic converters, even with the CEL for cat inefficiency.