others. My buddy had an older Stillen exhaust, which seemed fairly quiet, compared to most aftermarkets. The Genie was so much more pleasant when trying to talk at 70 mph. I want to add that the Genie added very noticeable power. I don't know of any real test comparisons for power with other cat-backs. I often wonder why someone doesn't make a Genie-type now. They are getting rare, and prices for decent ones has gone up over the last few years