Ive installed a few of them in the last few years, as we sold them where I worked until yesterday. Cheaper then the flowmaster. Alot of things do play a factor in sound quality and noise, so different vehicles will sound different then yours. Whether it be an inline 4, or a flat 4, flat 6 or v6/I6, or v8, size of pipe on both ends, inlet/outlet config, and length of tailpipe. Offset/offset(inlet/outlet) mufflers are quieter, sometimes alot quieter then center/center mufflers.