So I am thinking about buying the Cobb turboback exhaust and running the stage 2 tune from my accessport on my 2017 wrx. Since the exhaust is under the car I don't really care about appearance so is there really any reason why I shouldn't buy it used? This is what I was looking at 2015+ WRX COBB full turbo back exhaust. Also wondering if $1500 is a fair price since its about $2000 new. I am not much of a car expert so any help would be appreciated, thanks.