Covercrafts are great! Had one before and def getting one for the Mustang. They are around $50 - $60 but fit perfect and actually keep your car cooler. Money well spent.
On my few test drives I have experienced a few non-cooled and I think its cooled feeling. Where I live summers can get to 115+ degrees and cooled seats was a huge plus! The lower section is ok, but the lumbar area after I drove a Porsche, I decided I needed cooled seats. Granted, I dont think...
Have fun with the car! The Flowmaster outlaws are 50 state legal. Be respectful, but don't get bullied by neighbors. Also one of my neighbors cones and picks up someone with a loud exhaust and booming stereo. Used to bug me but now that I know they come and go it doesn't bug me.