REMARK Axleback Exhaust. Lexus IS300/ IS350 2021+. Stainless Double Wall TipThis REMARK axleback includes two high flow, straight through design muffler canisters. It produces a deep sporty exhaust note. This is ideal for those wanting an exhaust note without it being overbearing, and the primary sound heard from inside the car. There is a nice balance of a deep exhaust tone and the engine sound. We consider the sound volume quite mild, and feel it sounds like something you could purchase at the dealership as an optional