2018 Audi RS3 "stage 2": Intake, inlet, intercooler, downpipe, midpipes, exhaust, E85 tune by Darin on DS1 This Boost Logic titanium catback saves 44 lbs over the stock catback. It drones a lot, but keep in mind I have the version with NO VALVES, so I have not experienced this exhaust with closed valves...that definitely seems like it would help.