Rear Skirt + Racing Beat Cat Back

[WESLEEPTHEYLIVE]

I just ordered my racing beat cat-back exhaust but i also have a wings west rear wrap that i havn't put on my car yet. My question is....Should i install the exhaust first before I put on the rear-skirt to make sure there are no clearence issues or can i get my rear skirt put on now and install my racing beat later. Thanks in advance for the input.