Hello everyone this is my first post. I have a 2013 wrx sedan and I am looking for a tbe for it. I know this topic has been beaten to death and I have done plenty of Searching. Well, my question is, is there any noticeable difference in performance of a complete 3" inch system compared to one that tapers to 2.5". The reason I ask is because I want something that is not too loud. I cannot use the stock cbe as the previous owner installed a muffler delete. I am leaning towards the Cobb setup based on volume but would I be sacrificing performance compared to say a invidia tbe. Any help/ advice is appreciated .