I needed to reduce the exhaust stink, Im only running cheap high flow primary cats- got so tired of the strong exhaust smell so I ordered this high flow spun metallic conveter- I was skeptical as its small but to my suprise, once warmed up, the exhaust finally has almost no smell at all anymore. This is a high flow version so it will not decrease the exhaust sound as the holes in the mesh are large for flow so it won't hurt performance. This was installed behind a 270hp v6.
I bought these to replace some cheap cats that broke when I hit something I assume. They seem to be doing a much better job at cleaning up the exhaust fumes. They are kind of loud which I like and with no noticeable loss in HP. They also eliminate a lot of drone sounds I have with open exhaust.