Sinister Diesel products have quickly become some of our best selling performance diesel parts for the Ford Powerstroke 6.0L, Ford 6.4L, Ford 6.7L, Duramax LLY, as well as the Dodge Cummins 6.7L. Sinister Diesel products only offer the best quality parts and superior customer service. Be sure to check out fuel filter adapters, intake elbow, fuel return kits, throttle valve delete, fule tank sump kit, head gaskets, and EGR cooler upgrades from Sinister.