I have a 2006 350z touring 5at close to FBO with uprev dyno tune. And in the 1/4 I’m trapping 13.8s at 99-100mph, I really think my trap speed should be higher… and recommendations. Also I have…

So can anyone give me some insight on what would be louder, the cheap (hks replica) the Spec D Catback, or the Invidia N1? I know there is about a $300 difference but I’m just wondering which is…