Ya, it came with it. I THINK I have an extra one on a shelf.
Not sure why it would cause any interference, but at the very bottom of mine there is a little bump so it can't get too close .
2012 Focus Sport, ST Cat Back exhaust, Toms Tune
SOLD 2006 ZX3 SAP, Draxas Header, MBRP exhaust, CAI, Tuned, FRPP lowering kit, SVT 5spoke wheels, Halo Projector Headlights, Niteshaded Side markers/tails, Mazda rear wiper, mustang antenna