It's not a silencer, it's just a diffuser! Be careful what you order, there are steamed versions too. It acts as a diffuser, which is a USFS-approved spark arrestor. This product is amazing as it is one of the few customizable exhaust systems. I'm a mechanic and car builder with 30 years of experience. I've used a subdued version of this on a 454 large bokeh with very good results!