This is a custom Downpipe for Hahn setup. 2 1/4 like normal at the first bend for only a few inches, then as soon as the bend ends it opens up to 2.5" mandrel bent all the way to the cat with a flange to mate to the cat. Also has a small flex section and a bracket welded on to mount to the block. I have had this thing in my garage for awhile now and just need to sell it... lookin for $200 shipped or shoot me an offer if you think this is to high..thanks!!