Sinister Diesel is a national diesel truck parts manufacturer, headquartered in Roseville, CA. We are owned and operated by diesel enthusiasts who aim to bring high-performance parts and a little bit of a rebel lifestyle to our customers. Our high-performance parts are made in-house to be powerful, durable and to look good under the hood. The fact that we design and manufacture all of our parts in-house means we have optimal quality control. Our parts match our company culture, with a real work-hard, play-hard attitude.