Okay, so I am very slowly tuning my 2015 FiST. I currently have an AEM Cold Air Intake (picked first because I have a thing for that lovely wastegate sound) and I am stuck on what to do next. The two choices are either: A monotune quick shift AND a rear engine mount; or A FSWERKS 2 1/2" catback exhaust. What are your thoughts? I'd love to do both but don't have the free cash, so its the good old one at a time over the next few years deal.