I absolutely love what this back box did for my subie. It was the missing link to making my exhaust system complete. I have aftermarket UEL headers and high flow catalytic converter by inferno fab on the car already with the matching Stromung mid pipe. …But I was using not even a stock muffler. It was like whatever was used to replace the stock muffler at some cheap muffler joint before I owned the car. I wasn’t getting good performance and it didn’t sound very good either. It was raspy and restrictive. Once I got this muffler, it changed everything. The car drives so much smoother and has more power now. It was the missing piece I needed. It’s got a nice deep, smooth, low rumble that’s perfectly muted under wide open throttle and has a nice deep idle. Perfect Subaru sound.