TASSY5

A friend of mine today called me and said he was driving along a new model mustang that had wide deep dish rims on the rearof the car, and noticed it had a fine looking body kit. It had side exit exhaust AND rear exit exhaust flowing through cut outs in the rear bumper. What kit could that be?? Or is it probably a mix and match set up? and how did they make the exhaust functioal through both?

It was seen on the way to the Mandeville side of Lake Pontchartrain in Louisiana.