I'm thinking of getting the N1 for my 2014 si sedan. Which would be better the 70mm piping or the 76mm? There is about $100 difference, is it worth it? Would there be any difference in gains or sound? All I have is the HPS silicone intake tube and a k&n drop in filter. As of now I don't have any plans of doing anything else performance wise. If I ever change my mind the most I would do is intake/downpipe/flashpro. I will only stay NA and not go boost. I tried using search but couldn't find any answers.