The downpipe is a 2peice 3.5in design which meets to a 4in Titanium exhaust and we use a Ticon Titanium muffler . The idea behind this was to save weight over using a full stainless exhaust, however, this was too raspy for my liking and I would rather go back to stainless at some point like I had in V1. I would rather scarifice the weight than sound .