Worked great. I have an Impreza sedan with a non-original stainless steel exhaust. It had no resonator. This reduced the hum at 2300 rpm by at least half the original highway level. Now you can talk while driving, except maybe when you open the throttle as wide as possible. Easy installation - cut, snap, clamp (you will need clamps). Some regions may require you to weld it to pass vehicle inspection. Worked great.