Since I am not fimliar wih these cars yet I am wondering what I should do first with the car when i get it.

Already equipt with
-B&M shortthrow
-Borla Exhuast
-Stage 2 Clutch and Flywheel
-Injen Intake

I was thinking hi flow cat but I am used to cars with only one cat so who makes high flow cats fro these and which ones should I gut/ replace