Ah yes, RallyCross. I didn't think it was quite a Solo style.

If the class from which this is pulled is intended to be a street class, then the retention of operational emissions equipment is understandable. Also, given RallyCross' roots in Rally, remember that Rally cars must be street-legal (inspected and registered) for purposes of transits. I'm not certain if that philosophy has held over into RallyCross, but it wouldn't surprise me if it did...