Dinan D660-0360 is a free-flow axle-back exhaust for 1992-1999 BMW 3-Series E36 models. The system uses T304 stainless steel construction, polished tips, four exhaust tips, included clamps and hangers, and Dinan Tuned Resonance Chamber technology to improve flow while maintaining a sporty but controlled exhaust note. Dinan lists maximum gains of 6-11 HP and 5-13 lb-ft depending on application, with a 1-hour installation time. The product is listed as emissions-neutral.