i just bought a helix highflow cat and downpipe there is no question on the brand of the cat as you can see it has a large welded helix badge but the only thing i can find on the downpipe is a welded tag that says made in japan with a # on it, also the cat is seems to have a larger pipe im thinking the downpipe is 2.75? am i just triping out or is this thing smaller? i wanted a 3"