At Sinister Mfg. Company, Inc. ("Sinister Diesel®"), we are committed to protecting the integrity, performance, and reputation of our brand. Our signature blue finish, distinctive logo, and product line are synonymous with quality, innovation, and power in the diesel performance industry. The Sinister Diesel® brand is more than a name—it's a symbol of trust, craftsmanship, and dedication to excellence.

To preserve the value of our brand and ensure customers receive the best possible experience, Sinister Diesel® maintains a strict Unilateral Pricing Policy (UPP) and Minimum Advertised Price (MAP) Policy. These policies help protect our resellers, customers, and the long-term equity of our brand.

When you purchase Sinister Diesel® products either directly from Sinister Diesel or through one of our Authorized Dealers, you can be confident that you're receiving:

Purchasing Sinister Diesel® products from unauthorized resellers may put you at risk. Products from these sources may be:

To the extent permitted by law, Sinister Diesel® reserves the right to deny technical support, warranty coverage, or customer service for products purchased through unauthorized channels. All support and service inquiries will be referred to the original point of purchase.

Any direct or indirect sale of Sinister Diesel® products to unauthorized resellers—intentionally or unintentionally—will be considered a violation of our UPP/MAP Policy and may result in suspension or termination of dealer privileges.

We routinely monitor online and offline sales channels to enforce compliance and preserve the integrity of our brand. We appreciate our dealers' partnership and continued commitment to these policies.