First off since I'm still fairly new with a turbo setup correct me if im wrong.. the charging pipe replaces the CAI or SRI and places a pipe coming from the turbo to the tb correct?

If so my question is how big is the charging pipe for the L61 turbo kit on your site? I couldn't find it specified on the page but I'd imagine it's 2.5"+ preferably 3". Which I wouldn't even know if I would need 3" would it even make a difference?